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If
communication cannot be established between the airbag control unit and
TECH 1, locate the fault as specified in the following table.
After
completing the check, proceed with section 4.1.
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|
· Ignition
ON
· Measure voltage:
from: battery positive terminal
to: battery negative terminal
· Measure
voltage:
from: battery positive terminal
to: ground
|
higher than 11.5 V
higher than 11.5 V
|
· Battery
discharged
· Corroded
battery terminals
· Poor
battery ground connection
· Battery
defective
· Short
circuit to ground
from: battery +
to: fuses in fuse box
|
|
|
· Measure
voltage:
from: ALDL plug XD Ter. 16
to: ground
|
higher than 11 V
|
· Fuse
Fl 2 defective.
· Lead
interruption
from: battery +, Ter. 30
to: ALDL plug XD Ter. 16
· Short
circuit to ground
from: battery +, Ter. 30
to: ALDL plug XD Ter. 16
|
|
|
· Measure
voltage:
from: ALDL plug XD Ter. 4
to: ground
|
approx. 0 V
|
· Short
circuit in wiring harness
from: ALDL plug XD Ter. 4
to: battery +, Ter. 30
|
|
|
· Measure
voltage:
from: ALDL plug XD Ter. 16
to: ALDL plug XD Ter. 4
|
higher than 11 V
|
· Lead
interruption
from: ALDL plug XD Ter. 4
to: ground
|
|
|
· Carry
out TECH 1 self - test according to Operating Instructions
|
TECH 1 OK
|
· See
TECH 1 Operating Instructions
|
|
|
· Ignition
OFF
· Disconnect
TECH 1 from ALDL plug
· Disconnect
battery
· Disconnect
wiring harness plug from airbag control unit X90
· Connect
battery
· Ignition
ON
· Measure
voltage:
from: ALDL plug XD Ter. 12
to: ground
|
System telltale ON
approx. 0 V
|
· Fault
in system telltale circuit H23
· Short
circuit to voltage
from: ALDL plug XD Ter. 12
to: airbag control unit wiring harness plug
X90 Ter. 3 and Ter. 4
|
|
|
· Ignition
OFF
· Using
multimeter, measure resistance:
from: ALDL plug XD Ter. 12
to: airbag control unit wiring harness plug X90 Ter. 3
and Ter. 4
|
lower than 2W
|
· Lead
interruption
from: ALDL plug XD Ter. 12
to: airbag control unit wiring harness plug X90 Ter. 3
and Ter. 4
|
|
|
· Disconnect
all wiring harness plugs from control units which are connected to terminal
12 of diagnostic plug XD (ABS / Traction Control / Servotronic)
· Using
multimeter, measure resistance:
from: ALDL plug XD Ter. 12
to: ground
|
higher than 100 kW(¥)
|
· Short
circuit to ground
from: ALDL plug XD Ter. 12
to: airbag control unit wiring harness plug
X90 Ter. 3 and Ter. 4
|
|
|
· Measure
voltage:
from: airbag control unit wiring harness plug
X90 Ter. 7
to: ground
|
approx. 0 V
|
· Short
circuit to voltage
from: airbag control unit wiring harness plug
X90 Ter. 7
to: battery +, Ter. 30
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|
