Headlamp Leveling Malfunction (TR6)
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Ignition Headlamp Switch
|
1
|
1
|
-
|
-
|
Ignition Left Headlamp
|
1
|
2
|
-
|
-
|
Ignition Right Headlamp
|
1
|
3
|
-
|
-
|
Left Headlamp Leveling Control
|
1
|
2
|
1
|
-
|
Right Headlamp Leveling Control
|
1
|
3
|
1
|
-
|
Left Headlamp Ground
|
-
|
2
|
-
|
-
|
Right Headlamp Ground
|
-
|
3
|
-
|
-
|
1. All headlamp leveling actuator malfunction
2. Left headlamp leveling actuator malfunction
3. Right headlamp leveling actuator malfunction
|
|
| |
Circuit/System Description
Each headlamp assembly contains a headlamp leveling motor that
is controlled by the headlight switch. The headlight switch is a
resistance ladder switch and wired to each headlamp leveling motor.
With the ignition in ON position the headlight switch and each
headlamp leveling motor is applied to B+. Each headlamp leveling
motor is permanently grounded.
Reference Information
Schematic Reference
Headlights/Daytime Running Lights (DRL) Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, cycle the headlamp leveling switch in each position
while observing both headlamps. Both headlamps should operate to
the appropriate position when commanded.
Circuit/System Testing
| 1. |
Ignition OFF, disconnect the
harness connector at the appropriate inoperative headlamp
assembly. |
| 2. |
Disconnect the negative
terminal of the C1 Battery. |
| 3. |
Test for less than 5 Ω
between the ground circuit terminal 7 and ground. |
| ⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
| 4. |
Reconnect the negative
terminal to the C1 Battery. |
| 5. |
Ignition ON, verify that a
test lamp illuminates between the ignition circuit terminal 6 and
ground. The test lamp should illuminate. |
| ⇒ |
If the test lamp does not illuminate, test the
ignition circuit for a short to ground or an open/high
resistance. |
| 6. |
Ignition OFF, disconnect the
harness connector at the S30 Headlamp Switch. |
| 7. |
Ignition ON, connect a test
lamp between the ignition circuit terminal 9 and ground. The test
lamp should illuminate. |
| ⇒ |
If the test lamp does not illuminate, test the
ignition circuit for a short to ground or an open/high
resistance. |
| 8. |
Test for less than 0.3 V
between the signal circuit terminal 10 and ground. |
| ⇒ |
If greater than the specified range, test the
signal circuit for a short to voltage. |
| 9. |
Ignition OFF, install a 3 A
fused jumper wire between the signal circuit terminal 10 and B+.
Check fuse from jumper wire. |
| ⇒ |
If the fuse is blown, test the signal circuit for
a short to ground. |
| 10. |
Disconnect the 3 A fused
jumper wire, test for less than 5 Ω between the signal
circuit terminal 10 at the S30 Headlamp Switch and the control
circuit terminal 8 at the appropriate headlamp assembly.
|
| ⇒ |
If greater than the specified range, test the
signal circuit for an open/high resistance. |
| 11. |
Reconnect the harness
connector at the S30 Headlamp Switch. |
| 12. |
Ignition ON, test for 2.5-6.5
V between the control circuit terminal 8 at the appropriate
headlamp assembly and ground. Switch the headlamp leveling switch
in each position, the voltage should change in each
position. |
| ⇒ |
If the voltage does not change, test or replace
the S30 Headlamp Switch. |
| 13. |
If all circuits test normal,
replace the appropriate headlamp assembly. |
Component Testing
Static Test
| 1. |
Ignition OFF, disconnect the
harness connector at the S30 Headlamp Switch. |
| 2. |
Switch the headlamp leveling
switch in position 0. Test for 2.2-2.4 kΩ between the
ignition circuit terminal 9 and the signal terminal 10.
|
| ⇒ |
If not within the specified range, replace the S30
Headlamp Switch. |
| 3. |
Switch the headlamp leveling
switch in position 1. Test for 1.9-2.2 kΩ between the
ignition circuit terminal 9 and the signal terminal 10.
|
| ⇒ |
If not within the specified range, replace the S30
Headlamp Switch. |
| 4. |
Switch the headlamp leveling
switch in position 2. Test for 1.7-2.1 kΩ between the
ignition circuit terminal 9 and the signal terminal 10.
|
| ⇒ |
If not within the specified range, replace the S30
Headlamp Switch. |
| 5. |
Switch the headlamp leveling
switch in position 3. Test for 1.4-1.6 kΩ between the
ignition circuit terminal 9 and the signal terminal 10.
|
| ⇒ |
If not within the specified range, replace the S30
Headlamp Switch. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
