Skoda Workshop Service and Repair Manuals

Fault table   Note t  All the possible faults which can be detected by the dash panel insert and can be displayed by -V.A.G 1552- are listed according to the fault code. t  If “Info in literature” appears in the display of the vehicle system tester, look for the text required in the fault table under the fault code. t  The fault table is arranged according to the 5-digit fault code on the left. t  If a fault occurs only sporadically or if the fault memory was not erased after eliminating the fault, this “sporadic fault” is shown as “SP” on the display. t  Explanations on fault types (e.g. “interruption/short-circuit to earth”): → Operating instructions of vehicle system tester t  Before replacing components found to be defective first check the wiring and plug connections to these components as well as the earth cables according to the current flow diagram. This applies in particular if faults are shown as “sporadic” (SP).

Readout on -V.A.G 1552-		Possible cause of fault	Possible effects	Rectifying fault
00282
Throttle valve positioner -V60- → Note
	Short circuit	t  Line interruption or short-circuit to earth or positive and/or mutual line short-circuit	t  Cold start problems	–  Remove open circuit in wiring or short circuit according to current flow diagram → Current flow diagrams and Fitting locations.
			t  Cold idling problems
	blocked or dead	t  -V60- jams or defective	t  Rough load alteration	–  Inspecting throttle valve control unit → Chapter.
	Connection via plug	t  Cable mix-up	t  mechanical emergency running -J338- detected
	upper limit value	t  Control unit defective		–  Replacing engine control unit → Chapter.
	Signal outside tolerance
	Control difference
00305
Fuel consumption display signal
	Short circuit to positive	t  Short circuit to positive in the cable connection between the engine control unit and the onboard computer		–  Check fuel consumption display signal → Current flow diagrams and Fitting locations.

1)  The throttle valve positioner -V60 - is a component part of the throttle valve control unit -J338 -.

Readout on -V.A.G 1552-		Possible cause of fault	Possible effects	Rectifying fault
00513
Engine speed sender -G28-
	no signal	t  Signal line is interrupted or short-circuited to earth or positive	t  Engine stalls	–  Check -G28- → Chapter.
		t  Earth lead is interrupted or short-circuited to positive	t  Engine does not start
		t  Line interruption to shielding of -G28-
		t  -G28- defective
		t  Signal input in the engine control unit defective (engine control unit defective)		–  Replacing engine control unit → Chapter.
	implausible signal	t  Steel swarfs on the engine speed sender -G28-	t  Engine stalls	–  Check -G28- → Chapter.
		t  Distance between -G28- and sensor rotor too great	t  Engine does not start

Note t  Regarding fault code 00513: t  Additional signals can be generated by metal swarfs. t  Signals may not be generated or be too weak and therefore not be detected due to a too large distance of the sender to the sensor rotor or by a damaged sensor rotor. t  The signal routing can be irregular due to a loose sensor rotor (or loose sensor).

Readout on -V.A.G 1552-		Possible cause of fault	Possible effects	Rectifying fault
00515
Hall sender -G40-
	no signal	t  Voltage supply or earth distribution to -G40- defective	t  Engine does no longer reach the deactivation speed (speed limiter at approx. 5100/rpm)	–  Check -G40- → Chapter.
	implausible signal	t  Signal input in the engine control unit defective (engine control unit defective)	t  Engine does not start or starts poorly when cold (cold-start difficulties)	–  Replacing engine control unit → Chapter.
	defective	t  Line interruption or short-circuit to positive or earth between -G40- and the engine control unit	t  Engine does not start or starts poorly when warm (hot-start difficulties)	–  Remove open circuit in wiring or short circuit according to current flow diagram → Current flow diagrams and Fitting locations.
		t  -G40- defective	t  reduced performance
		t  Toothed belt skipped (signal is not generated at the expected time) t  Loose contact		–  Check timing of the engine → 1.6 ltr./74 kW Engine, Mechanics → Rep. Gr.13.
00516
Idling switch -F60- → Note
	Open circuit/Short circuit to positive	t  Line interruption or short-circuit to earth or positive between -F60- and the engine control unit	t  Poor vehicle handling when starting	–  Inspecting throttle valve control unit → Chapter. –  Remove open circuit in wiring or short circuit according to current flow diagram → Current flow diagrams and Fitting locations.
	Short circuit to earth	t  -F60- defective	t  Poor vehicle handling when proceeding to idling/overrun at partial load	–  Check the throttle cable setting → 1.6 ltr./74 kW Engine, Mechanics → Rep. Gr.20.
		t  Throttle valve jams
		t  Foot mat presses onto accelerator pedal	t  Idling speed not within the specified value
		t  Throttle cable setting
		t  Humidity in the plug connection for the throttle valve control unit	t  Acceleration jerks t  Idling control behaviour unstable t  Load alteration shock when releasing the accelerator	–  Check plug connections.
		t  Signal input in the engine control unit defective (engine control unit defective)		–  Replacing engine control unit → Chapter.

2)  The idling switch -F60- is a component part of the throttle valve control unit -J338-.

Readout on -V.A.G 1552-		Possible cause of fault	Possible effects	Rectifying fault
00518
Throttle valve potentiometer -G69- → Note
	Short circuit to positive	t  Line interruption in the earth line
		t  Line short-circuit to positive	t  Rough load alteration	–  Check -G69- → Chapter.
		t  -G69- defective
	Short circuit to earth	t  -G69- defective	t  Poor throttle response of the engine	–  Eliminate line interruption or short circuit according to current flow diagram.
		t  Line interruption		→ Current flow diagrams and Fitting locations
		t  Short circuit to earth in cable connection between - G69- and engine control unit
	implausible signal	t  Loose contact t  -G69- defective		→ Current flow diagrams and Fitting locations
		t  Humidity and/or corrosion in the plug connection at the potentiometer	t  Acceleration jerks t  Idling control behaviour unstable t  Load alteration shock when releasing the accelerator	–  Check plug connections.
		t  Signal input in the engine control unit defective (engine control unit defective)		–  Replacing engine control unit → Chapter.

3)  The throttle valve potentiometer - G69- is a component part of the throttle valve control unit -J338 -.

Readout on -V.A.G 1552-		Possible cause of fault	Possible effects	Rectifying fault
00520
Air mass/volume measurement -G70/G19-
	Short circuit to positive	t  Line interruption or short-circuit to positive or earth between -G70- and the engine control unit	t  Poor vehicle handling t  Engine does not start or starts poorly when cold (cold-start difficulties)	–  Check -G70- → Chapter.
	Open circuit/Short-circuit to earth	t  Voltage supply for -G70- defective	t  Engine does not start or starts poorly when warm (hot-start difficulties)	–  Read measured value block, display group 000 → Chapter.
		t  -G70- defective	t  Irregular idling or no idling in cold-running or warming-up phase	–  -G70- replace.
		t  Signal input in the engine control unit defective (engine control unit defective)	t  Idling speed not within the tolerance	–  Replacing engine control unit → Chapter.
00522
Coolant temperature sender -G62-
	Open circuit/Short circuit to positive	t  Line interruption or short-circuit to positive or earth between -G62- and the engine control unit	t  Cold-start difficulties at very low temperatures t  Poor driveability during warm-up	–  Read measured value block, display group 000 → Chapter.
	Short circuit to earth	t  -G62- defective
	implausible signal	t  Earth distribution to -G62- defective	t  Increased fuel consumption	–  Check -G62- → Chapter.
		t  Signal input in the engine control unit defective (engine control unit defective)	t  Increased emission levels	–  Replacing engine control unit → Chapter.
		t  Loose contact or corrosion due to humidity in the connector	t  Poor performance
00523
Intake air temperature sender -G42-
	Short circuit to earth	t  Line interruption or short-circuit to positive or earth between -G42- and the engine control unit	t  Poor hot-start performance	–  Read measured value block, display group 000 → Chapter.
	Open circuit/Short circuit to positive	t  -G42- defective	t  Poor throttle response of the engine during cold-running or warming-up phase, transient malfunctions	–  Check -G42 - → Chapter.
		t  Earth distribution to -G42- defective
		t  Signal input in the engine control unit defective (engine control unit defective)	t  Irregular idling or no idling in cold-running or warming-up phase	–  Replacing engine control unit → Chapter.
00524
Knock sensor 1 -G61-
	defective	t  -G61- defective		–  Check -G61- → Chapter.
	implausible signal	t  Knock sensor loose or corrosion at the connector	t  reduced performance
		t  Line interruption or short-circuit to positive or to earth and/or to shielding of the signal line between the knock sensor and the engine control unit	t  Increased fuel consumption	–  Remove open circuit in wiring or short circuit according to current flow diagram → Current flow diagrams and Fitting locations.
		t  Signal input in the engine control unit defective (engine control unit defective)		–  Replacing engine control unit → Chapter.
		t  loose ancillaries through which the knock sensor detects additional signals (vibrations)
00525
Lambda probe -G39-
	Output open	t  Line interruption or short-circuit to earth or positive between -G39- and the engine control unit	t  no lambda control	–  Remove open circuit in wiring or short circuit according to current flow diagram → Current flow diagrams and Fitting locations.
	Short circuit to earth	t  Earth distribution to -G39- defective	t  Poor idling	–  Checking lambda control → Chapter.
	implausible signal	t  Corrosion due to humidity in the plug connection for lambda probe heater -Z19- or lambda probe -G39 -	t  Increased fuel consumption	–  Read measured value block, display group 001 → Chapter or 099 → Chapter.
	Signal outside tolerance	t  Lambda probe heater does not operate	t  Sooting of spark plugs
		t  -G39- defective	t  Increased emission levels
		t  Signal input in the engine control unit defective (engine control unit defective)		–  Replacing engine control unit → Chapter.
00530
Throttle valve positioner/potentiometer -G88- → Note
	Open circuit/Short circuit to positive	t  Open circuit in wiring between -G88- and the engine control unit or short-circuit to positive	t  The idle regulator is deactivated; engine runs in idle with mechanically defined amount of air through the emergency gap t  changed idling speed	–  Perform adaptation of the throttle valve control unit → Chapter.
	Open circuit/Short-circuit to earth	t  Open circuit in wiring between -G88- and the engine control unit or short-circuit to earth	t  Cold start problems t  Cold idling problems	–  Inspecting throttle valve control unit → Chapter.
	implausible signal	t  -G88- defective/loose contact in plug connection for throttle valve control unit -J338-	t  Rough load alteration
		t  Signal input in the engine control unit defective (engine control unit defective)	t  reduced performance	–  Replacing engine control unit → Chapter.
		t  Transition impedances due to humidity in the plug connection for the throttle valve control unit -J338-	t  irregular idling
		t  incorrect plug assignment
00533
Idling control
	upper limit value	t  Throttle valve positioner -V60- jams	t  Poor vehicle handling	–  Inspecting throttle valve control unit → Chapter.
		t  Air filter blocked	t  Increased fuel consumption	–  Testing the intake system for tightness (unmetered air) → Chapter.
	lower limit value	t  Unmetered air to throttle valve	t  Smell of fuel	–  Testing injection valves → Chapter.
		t  Injection valve defective
		t  Fuel pressure regulator defective		–  Replace the fuel pressure regulator.

4)	The throttle valve positioner/potentiometer -G88- is a component part of the throttle valve control unit - J338-. The throttle valve positioner/potentiometer (variable resistance, activated by the throttle valve positioner) notifies the position of the throttle valve to the engine control unit.

Readout on -V.A.G 1552-		Possible cause of fault	Possible effects	Rectifying fault
00537
Lambda control
	upper limit value	t  Line short-circuit to earth in the signal line from the engine control unit to the lambda probe	t  no lambda control	–  Checking lambda control → Chapter.
		t  Injection valve(s) defective (blocked)	t  Poor vehicle handling	–  Testing injection valves → Chapter.
		t  Fuel pressure regulator defective		–  Test fuel pressure regulator and holding pressure → Chapter.
		t  Fuel pump defective		–  Test fuel pump → 1.6 ltr./74 kW Engine, Mechanics → Rep. Gr.20.
		t  Unmetered air		–  Check induction pipe for leaks.
		t  Fuel tank empty		–  Fill up vehicle.
	lower limit value	t  Activated charcoal filter system solenoid valve 1 -N80- leaking, jams	t  no lambda control	–  Check -N80- → Chapter, → Chapter.
		t  Injection valve(s) defective (always open)	t  Poor vehicle handling	–  Testing injection valves → Chapter.
		t  Fuel pressure regulator defective		–  Test fuel pressure regulator and holding pressure → Chapter.

Note t  Regarding fault code 00537: t  If the fault “lambda control top limit” is detected, the lambda control has reached the regulating limit in direction of “enrich”. However the lambda probe still evaluates “lean mixture”. t  If the fault “lambda control bottom limit” is detected, the lambda control has reached the regulating limit in direction of “lean”. The lambda probe still evaluates “rich mixture”.

Readout on -V.A.G 1552-		Possible cause of fault	Possible effects	Rectifying fault
00545
Engine/gearbox electrical connection
	Short circuit to positive	t  Short-circuit to positive between engine control unit and automatic gearbox control unit	t  see workshop manual automatic gearbox → automatic gearbox → Rep. Gr.01	–  Remove open circuit in wiring or short circuit according to current flow diagram → Current flow diagrams and Fitting locations.
	Short circuit to earth	t  Short-circuit to earth between engine control unit and automatic gearbox control unit	t  Signal output in the engine control unit defective (engine control unit defective)	–  Replacing engine control unit → Chapter.
	undefined switch status	t  Fault on automatic gearbox or on automatic gearbox control unit		–  Interrogate the fault memory of the automatic gearbox control unit → automatic gearbox → Rep. Gr.01.
For vehicles 08.97 ►
00557
PAS pressure switch -F88- → Note
	Short circuit to earth	t  Short circuit to earth t  -F88- defective	t  the engine stalls at maximum steering angle	–  Test signal of PAS pressure switch → Chapter.
	Short circuit to positive	t  Short circuit to positive t  -F88- defective
00609
Ignition outlet 1
	Short circuit to positive	t  Line interruption or short-circuit between engine control unit and end stage to the ignition coil	t  Starting problems t  greatly irregular engine running in all load ranges t  great loss of power	–  Remove open circuit in wiring or short circuit according to current flow diagram → Current flow diagrams and Fitting locations.
		t  Earth connection of the end stage to the ignition coil defective		–  Check dual spark ignition system with two ignition coils → Chapter.
		t  End stage to the ignition coil defective
		t  Engine control unit defective		–  Replacing engine control unit → Chapter.

5)	If the fault 00557 is stored, the fault 00533 can also be stored as a follow-up fault.

Readout on -V.A.G 1552-		Possible cause of fault	Possible effects	Rectifying fault
00610
Ignition outlet 2
	Short circuit to positive	–  see fault code “00609”	–  see fault code “00609”	–  see fault code “00609”.
00625
Vehicle speed signal
	implausible signal	t  Line interruption or short-circuit between dash panel insert and engine control unit		–  Remove open circuit in wiring or short circuit according to current flow diagram → Current flow diagrams and Fitting locations.
		t  Short-circuit in the signal line between the speedometer and another control unit which uses the speed signal
		t  Signal input in the engine control unit defective (engine control unit defective).		–  Replacing engine control unit → Chapter.

t	Regarding fault code 00609 and 00610:

t	The “ignition outlet 1” and/or “ignition outlet 2” are the outlets at the engine control unit which are used by the engine control unit to actuate the power output stage at the ignition coil.

t	Regarding fault code 00625:

t	If the fault “00625” is stored, the engine control unit adopts a fixed replacement value of 5°km/h.

Readout on -V.A.G 1552-		Possible cause of fault	Possible effects	Rectifying fault
00635
Lambda probe heating upstream of catalytic converter
	defective	t  Line interruption or short-circuit to positive and/or earth between engine control unit and lambda probe	t  irregular idling t  possible exhaust problems	–  Checking lambda control → Chapter. –  Remove open circuit in wiring or short circuit according to current flow diagram → Current flow diagrams and Fitting locations.
		t  Power output stage in the engine control unit defective (engine control unit defective).		–  Replacing engine control unit → Chapter.
		t  Lambda probe defective		–  Replace lambda probe.
		t  Fuel pump relay/actuation of fuel pump relay defective		–  Test fuel pump relay and control → Chapter.

t	Regarding fault code 00635:

t	The positive voltage supply for the lambda probe heating occurs via the fuel pump relay.

t	The earth distribution for the lambda probe heating is performed by the engine control unit, i.e the total filament current for the lambda probe heating flows via the engine control unit.

Readout on -V.A.G 1552-		Possible cause of fault	Possible effects	Rectifying fault
For vehicles 08.97 ►
00650
Clutch pedal switch -F36-
	defective	t  Line interruption or short-circuit		–  Test the signal of the clutch pedal switch → Chapter.
For vehicles 08.97 ►
00668
El. syst. voltage tml. 30
	Open circuit	t  Line interruption/loose contact in the wiring to the engine control unit		–  Check voltage supply of the control unit → Current flow diagrams and Fitting locations. –  Perform adaptation of the throttle valve control unit → Chapter.
For vehicles 08.98 ►
01013
AC compressor, load signal
	Open circuit/Short-circuit to earth	t  Line interruption or short-circuit to earth		–  Check measured value block 57 → Chapter. –  Test cable connections for short circuit and/or for interruption → Current flow diagrams and Fitting locations.
	Short circuit to positive	t  Short circuit to positive		–  Check measured value block 57 → Chapter. –  Test cable connections for short circuit and/or for interruption → Current flow diagrams and Fitting locations.
01087
Basic setting not performed
	implausible signal	Conditions for the basic setting (adaptation of the throttle valve control unit) not fulfilled: t  Ignition not switched on t  Engine not in standstill t  Idling switch not closed t  Voltage of the throttle valve potentiometer and the throttle valve positioner potentiometer implausible (cannot be accurately detected by the engine control unit; throttle valve not completely closed) t  Throttle valve positioner jams/mechanically damaged	t  The engine control unit cannot learn the stop positions of the throttle valve because the conditions are not fulfilled for this (see possible fault cause)	–  Read measured value block, display group 001 or 098 → Chapter or → Chapter. –  Inspecting throttle valve control unit → Chapter. –  Interrogating fault memory. –  Perform adaptation of the throttle valve control unit → Chapter.
		t  Battery voltage too low (below 8 V)		–  Read measured value block, display group 005 → Chapter.
		t  Fault in fault memory	t	–  Interrogating fault memory.
		t  Throttle valve control unit defective		–  Replace throttle valve control unit.
		t  Engine control unit defective		–  Replacing engine control unit → Chapter.
01126
Engine speed signal
	defective	t  Line interruption or short-circuit to positive and/or earth between engine control unit and dash panel insert	t  Rev counter not operating	–  Remove open circuit in wiring or short circuit according to current flow diagram → Current flow diagrams and Fitting locations.
		t  Signal input on the dash panel insert defective		–  Replace dash panel insert.
		t  Signal output in the engine control unit defective (engine control unit defective)		–  Replacing engine control unit → Chapter.

t	Regarding fault code 01126:

t	In this case, the “engine speed signal” is not the signal of the rotary speed sender at the crankshaft to the engine control unit, however the signal of the engine control unit to the dash panel insert which can then be used for various other systems (e.g rev counter, air conditioning system, 0).

Readout on -V.A.G 1552-		Possible cause of fault	Possible effects	Rectifying fault
01163
Breakdown of the ignition
		t  Line interruption in the ignition circuit t  Fault in the wiring to the spark plug	t  irregular engine running	–  Check dual spark ignition system with two ignition coils → Chapter.
01177
Engine control unit
	defective	t  Earth lead in the engine control unit is interrupted t  Engine control unit defective	t  Engine does not start	–  Check voltage supply of the control unit → Chapter. –  Replacing engine control unit → Chapter.
01242
End stages in the control unit
	defective	t  Engine control unit defective	t  Engine does not start	–  Replacing engine control unit → Chapter.

t	Regarding fault code 01163:

t	The engine can be restarted after erasing the fault memory → Chapter.

Readout on -V.A.G 1552-		Possible cause of fault	Possible effects	Rectifying fault
01243
Valve for variable intake manifold changeover - N156-
	Output open	t  Line interruption or short-circuit to positive or earth between the valve for variable intake manifold changeover -N156- and the engine control unit	t  reduced performance	–  Remove open circuit in wiring or short circuit according to current flow diagram → Current flow diagrams and Fitting locations.
	Short circuit to positive	t  Voltage supply for -N156- defective		–  Check -N156- → Chapter.
	Short circuit to earth	t  -N156- defective
		t  Signal output in the engine control unit defective (engine control unit defective)		–  Replacing engine control unit → Chapter.
01247
Activated charcoal filter system solenoid valve 1 -N80-
	Short circuit to positive	t  Line interruption or short circuit to positive between - N80- and engine control unit	t  possible irregular idling	–  Remove open circuit in wiring or short circuit according to current flow diagram → Current flow diagrams and Fitting locations.
	Short circuit to earth	t  Voltage supply for -N80- defective	t  possible jerking in partial load region	–  Check -N80- → Chapter.
	Output open	t  -N80- defective	t  Vehicle may possibly smell of fuel
		t  Signal output in the engine control unit defective (engine control unit defective)		–  Replacing engine control unit → Chapter.
01249
Injector cyl. 1 -N30-
	Short circuit to positive	t  Line interruption or short-circuit to positive and/or earth between engine control unit and injection valve	t  irregular idling, if necessary engine stalls	–  Testing injection valves → Chapter.
	Short circuit to earth	t  Injection valve defective
	Output open	t  Voltage supply for injection valve defective
		t  Signal output in the engine control unit defective (engine control unit defective)		–  Replacing engine control unit → Chapter.
01250
Injector cyl. 2 -N31-
	Short circuit to positive	⇒ Cylinder 1 fault code “01249”	⇒ Cylinder 1 fault code “01249”	⇒ Cylinder 1 fault code “01249”.
	Short circuit to earth
	Output open
01251
Injector cyl. 3 -N32-
	Short circuit to positive	⇒ Cylinder 1 fault code “01249”	⇒ Cylinder 1 fault code “01249”	⇒ Cylinder 1 fault code “01249”.
	Short circuit to earth
	Output open
01252
Injector cyl. 4 -N33-
	Short circuit to positive	⇒ Cylinder 1 fault code “01249”	⇒ Cylinder 1 fault code “01249”	⇒ Cylinder 1 fault code “01249”.
	Short circuit to earth
	Output open

Readout on -V.A.G 1552-		Possible cause of fault	Possible effects	Rectifying fault
01259
Fuel pump relay -J17-
	defective	t  Line interruption or short circuit to positive between engine control unit and fuel pump relay	t  Line interruption or short circuit to positive (no engine running)	–  Remove open circuit in wiring or short circuit according to current flow diagram → Current flow diagrams and Fitting locations.
		t  Fuel pump relay defective		–  Test fuel pump relay and control → Chapter.
		t  Signal output in the engine control unit defective (engine control unit defective)		–  Replacing engine control unit → Chapter.

t	Regarding fault code 01259:

t	If the fault “01259” is stored, component parts can also be displayed as faulty which are supplied with voltage via the fuel pump relay → Current flow diagrams and Fitting locations.

Readout on -V.A.G 1552-		Possible cause of fault	Possible effects	Rectifying fault
For vehicles 08.97 ►
01312
Data bus drive		t  Faults in the databus lines	t  poor driveability (jerking when changing gears, load alteration shock) t  no vehicle dynamic control	–  Test databus drive → Chapter.
For vehicles 08.97 ►
01315
Gearbox control unit no communication		t  Fault in the databus lines to the engine control unit	t  poor driveability (jerking when changing gears, load alteration shock)	–  Test databus drive → Chapter.
For vehicles 08.97 ►
01316
Brake control unit no communication		t  Faults in the databus lines to ABS control unit	t  no vehicle dynamic control	–  Test databus drive → Chapter.
01321
Airbag control unit-J234- no communication		t  Faults in the databus lines to airbag control unit	t  The fuel pump is not switched off in case of accident with deployment of airbag	–  Test data bus → Chapter.
17978
Engine control unit blocked		t  Manipulation attempt
		t  Line interruption or short-circuit to positive and/or earth between engine control unit and immobilizer control unit	t  Engine starts briefly but then stops immediately	–  Remove open circuit in wiring or short circuit according to current flow diagram → Current flow diagrams and Fitting locations.
		t  Immobilizer control unit defective		–  Replace dash panel insert.
		t  Signal input in the engine control unit defective (engine control unit defective)		–  Replacing engine control unit → Chapter.
		t  Start attempt with unauthorised ignition key		–  Adapt ignition key → Electrical System. → Rep. Gr.96.
		t  Engine control unit not adapted to immobilizer control unit		–  Adapt the engine control unit to the immobiliser control unit → Chapter.
65535
Control unit defective		t  Faults within the engine control unit	t  Poor vehicle handling t  Engine stoppage	–  Replacing engine control unit → Chapter.

Note The immobilizer control unit is located in the dash panel insert and cannot be replaced individually.