Turn Signal Lamps and/or Indicators Malfunction w/o TT6
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
IGN E Fuse B+ | 2 | 2 | -- | -- |
Turn Signal/Hazard Flasher Module Signal | 3 | 3 | -- | -- |
Turn Signal/Multifunction Switch Signal | 2 | 2 | -- | -- |
Left or Right Turn Signal Switch Signal | 2 | 2 | 2 | -- |
Left or Right Turn Signal Control | 1 | 1 | 1 | -- |
Turn Signal Lamp Ground | -- | 1 | -- | -- |
Turn Signal/Hazard Flasher Module Ground | -- | 3 | -- | -- |
1. Turn Signal Lamps Malfunction 2. Turn SIgnal Switch Malfunction 3. Turn Signal/Hazard Flasher Module Malfunction | ||||
Circuit/System Description
The IGN E fuse in the engine wiring harness junction block supplies Ignition positive voltage to the turn signal switch assembly. With the ignition switch in the RUN or START position, ignition positive voltage is connected through the turn signal switch assembly to the turn signal/hazard flasher module which is powered by the HAZARD fuse also in the engine wiring harness junction block and is grounded at G201. When the turn signal switch is placed in either the left or right position, the circuit is complete from the turn signal/hazard flasher module to the turn signal lamps and to ground. The turn signal/hazard flasher module then sends an on-off voltage signal to either the left or right turn signals and their instrument panel cluster (IPC) indicator. When the hazard switch is pressed, all turn signal lamps will flash including both IPC turn indicators. The front turn signals are grounded at G103 and G107. The rear turn signals are grounded at G401 and G402.
Reference Information
Schematic Reference
Connector End View Reference
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, operate the turn signal switch to the Left and Right positions. Verify the turn signal lamps and indicators turn ON and OFF as the switch is placed in the appropriate positions.
| ⇒ | If the turn signal lamps do not illiminate ON and OFF when commanded, refer to Turn Signal Lamps Malfunction. |
| ⇒ | If the turn signal lamps illiminate ON and OFF and the turn signal indicators are inoperative, refer to Turn SIgnal Indicators Malfunction. |
Circuit/System Testing
Turn Signal Lamps Malfunction
- Ignition OFF, disconnect the X1 harness connector at the turn signal/multifunction switch.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal G and ground.
- Ignition ON, connect a test lamp between the left turn signal circuit terminal F and ground. The test lamp should not illuminate.
- Ignition ON, connect a test lamp between the right turn signal circuit terminal H and ground. The test lamp should not illuminate.
- Ignition ON, connect a 10A fused jumper between the ignition circuit terminal G and the left turn signal switch signal circuit terminal F. Both left turn signal lamps should illuminate.
- Ignition ON, connect a 10A fused jumper between the ignition circuit terminal G and the right turn signal switch signal circuit terminal H. Both right turn signal lamps should illuminate.
- Connect the harness connector at the turn signal/multifunction switch.
- Disconnect the harness connector at the turn signal/hazard flasher module.
- Test for less than 5 ohms between the ground circuit terminal E and ground.
- Ignition ON, connect a test lamp between the left turn signal circuit terminal F and ground. Left turn signals ON, the test lamp should flash ON and OFF.
- Ignition ON, connect a test lamp between the right turn signal circuit terminal A and ground. Right turn signals ON, the test lamp should flash ON and OFF.
- Connect the harness connector at the turn signal/hazard flasher module.
- Remove the fuse at the inoperative turn signal lamp.
- Connect a test lamp between the turn signal/hazard flasher module signal circuit of the inoperative turn signal fuse and ground. Ignition ON, place the turn signal switch in the position of the inoperative lamp. The test lamp should flash ON and OFF.
- Install the fuse of the inoperative turn signal lamp.
- Ignition OFF, disconnect the harness connector at the inoperative turn signal lamp.
- Test for less than 5.0 ohms between the listed ground circuit terminals and ground.
- Connect a test lamp between the listed turn signal control circuit terminal and ground.
- Ignition ON, operate the inoperative turn signal ON and OFF. The test lamp should flash and turn OFF when changing between the commanded states.
- If all circuits test normal, test or replace the inoperative turn signal lamp.
| ⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp illuminates, test the signal circuit for a short to voltage. |
| ⇒ | If the test lamp illuminates, test the signal circuit for a short to voltage. |
| ⇒ | If the left turn signal lamps do not illuminate, test the signal circuit terminal F for a short to ground or an open/high resistance. If the circuit tests normal, replace the turn signal/hazard flasher module. |
| ⇒ | If the right turn signal lamps do not illuminate, test the signal circuit terminal H for a short to ground or an open/high resistance. If the circuit tests normal, replace the turn signal/hazard flasher module. |
| ⇒ | If more than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the turn signal/multifunction switch. |
| ⇒ | If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the turn signal/multifunction switch. |
| ⇒ | If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the turn signal/multifunction switch. |
| ⇒ | If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the turn signal/multifunction switch. |
| ⇒ | If the fuse is open, test the control circuit of the inoperative lamp for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp is always ON, test the signal circuit of the inoperative lamp for a short to voltage. If the circuit tests normal, replace the turn signal/hazard flasher module. |
| ⇒ | If the test lamp is always OFF, test the signal cicuit of the inoperative lamp for a short to ground or an open/high resistance. If the circuit tests normal, replace the turn signal/hazard flasher module. |
| • | Front Park/Turn Signal Lamp terminal 3 |
| • | Rear Turn Signal Lamp terminal GRD |
| ⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
| • | Front Park/Turn Signal Lamp terminal 1 |
| • | Rear Turn Signal Lamp terminal MJR |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. |
Turn SIgnal Indicators Malfunction
- Ignition OFF, disconnect the harness connector from the instrument panel cluster (IPC).
- Connect a test lamp between the right turn signal indicator control circuit terminal A1 and ground. Ignition ON, right turn signal ON, the test lamp should turn ON and OFF.
- Connect a test lamp between the left turn signal indicator control circuit terminal B10 and ground. Ignition ON, left turn signal ON, the test lamp should turn ON and OFF.
- If the circuits test normal, replace the IPC.
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Turn Signal Lamps and/or Indicators Malfunction w/TT6
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
IGN E Fuse B+ | 2 | 2 | -- | -- |
Turn Signal/Hazard Flasher Module Signal | 3 | 3 | -- | -- |
Turn Signal/Multifunction Switch Signal | 2 | 2 | -- | -- |
Left or Right Turn Signal Switch Signal | 2 | 2 | 2 | -- |
Left or Right Turn Signal Control | 1 | 1 | 1 | -- |
Turn Signal Lamp Ground | -- | 1 | -- | -- |
Turn Signal/Hazard Flasher Module Ground | -- | 3 | -- | -- |
1. Turn Signal Lamps Malfunction 2. Turn SIgnal Switch Malfunction 3. Turn Signal/Hazard Flasher Module Malfunction | ||||
Circuit/System Description
The IGN E fuse in the engine wiring harness junction block supplies Ignition positive voltage to the turn signal switch assembly. With the ignition switch in the RUN or START position, ignition positive voltage is connected through the turn signal switch assembly to the turn signal/hazard flasher module which is powered by the FLASHER fuse also in the engine wiring harness junction block and is grounded at G201. When the turn signal switch is placed in either the left or right position, the circuit is complete from the turn signal/hazard flasher module to the turn signal lamps and to ground. The turn signal/hazard flasher module then sends an on-off voltage signal to either the left or right turn signals and their instrument panel cluster (IPC) indicator. When the hazard switch is pressed, all turn signal lamps will flash including both IPC turn indicators. The front turn signals are grounded at G103 and G107. The rear turn signals are grounded at G401 and G402.
Reference Information
Schematic Reference
Connector End View Reference
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, operate the turn signal switch to the Left and Right positions. Verify the turn signal lamps and indicators turn ON and OFF as the switch is placed in the appropriate positions.
| ⇒ | If the turn signal lamps do not illiminate ON and OFF when commanded, refer to Turn Signal Lamps Malfunction. |
| ⇒ | If the turn signal lamps illiminate ON and OFF and the turn signal indicators are inoperative, refer to Turn SIgnal Indicators Malfunction. |
Circuit/System Testing
Turn Signal Lamps Malfunction
- Ignition OFF, disconnect the X1 harness connector at the turn signal/multifunction switch.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal G and ground.
- Ignition ON, connect a test lamp between the left turn signal circuit terminal F and ground. The test lamp should not illuminate.
- Ignition ON, connect a test lamp between the right turn signal circuit terminal H and ground. The test lamp should not illuminate.
- Ignition ON, connect a 10A fused jumper between the ignition circuit terminal G and the left turn signal switch signal circuit terminal F. Both left turn signal lamps should illuminate.
- Ignition ON, connect a 10A fused jumper between the ignition circuit terminal G and the right turn signal switch signal circuit terminal H. Both right turn signal lamps should illuminate.
- Connect the harness connector at the turn signal/multifunction switch.
- Disconnect the harness connector at the turn signal/hazard flasher module.
- Test for less than 5 ohms between the ground circuit terminal N and ground.
- Ignition ON, connect a test lamp between the left turn signal circuit terminal L and ground. Left turn signals ON, the test lamp should flash ON and OFF.
- Ignition ON, connect a test lamp between the right turn signal circuit terminal M and ground. Right turn signals ON, the test lamp should flash ON and OFF.
- Connect the harness connector at the turn signal/hazard flasher module.
- Remove the fuse at the inoperative turn signal lamp.
- Connect a test lamp between the turn signal/hazard flasher module signal circuit of the inoperative turn signal fuse and ground. Ignition ON, place the turn signal switch in the position of the inoperative lamp. The test lamp should flash ON and OFF.
- Install the fuse of the inoperative turn signal lamp.
- Ignition OFF, disconnect the harness connector at the inoperative turn signal lamp.
- Test for less than 5.0 ohms between the listed ground circuit terminals and ground.
- Connect a test lamp between the listed turn signal control circuit terminal and ground.
- Ignition ON, operate the inoperative turn signal ON and OFF. The test lamp should flash and turn OFF when changing between the commanded states.
- If all circuits test normal, test or replace the inoperative turn signal lamp.
| ⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp illuminates, test the signal circuit for a short to voltage. |
| ⇒ | If the test lamp illuminates, test the signal circuit for a short to voltage. |
| ⇒ | If the left turn signal lamps do not illuminate, test the signal circuit terminal F for a short to ground or an open/high resistance. If the circuit tests normal, replace the turn signal/hazard flasher module. |
| ⇒ | If the right turn signal lamps do not illuminate, test the signal circuit terminal H for a short to ground or an open/high resistance. If the circuit tests normal, replace the turn signal/hazard flasher module. |
| ⇒ | If more than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the turn signal/multifunction switch. |
| ⇒ | If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the turn signal/multifunction switch. |
| ⇒ | If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the turn signal/multifunction switch. |
| ⇒ | If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the turn signal/multifunction switch. |
| ⇒ | If the fuse is open, test the control circuit of the inoperative lamp for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp is always ON, test the signal circuit of the inoperative lamp for a short to voltage. If the circuit tests normal, replace the turn signal/hazard flasher module. |
| ⇒ | If the test lamp is always OFF, test the signal circuit of the inoperative lamp for a short to ground or an open/high resistance. If the circuit tests normal, replace the turn signal/hazard flasher module. |
| • | Front Park/Turn Signal Lamp terminal 3 |
| • | Rear Turn Signal Lamp terminal GRD |
| ⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
| • | Front Park/Turn Signal Lamp terminal 1 |
| • | Rear Turn Signal Lamp terminal MJR |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. |
Turn SIgnal Indicators Malfunction
- Ignition OFF, disconnect the harness connector from the instrument panel cluster (IPC).
- Connect a test lamp between the right turn signal indicator control circuit terminal A1 and ground. Ignition ON, right turn signal ON, the test lamp should turn ON and OFF.
- Connect a test lamp between the left turn signal indicator control circuit terminal B10 and ground. Ignition ON, left turn signal ON, the test lamp should turn ON and OFF.
- If the circuits test normal, replace the IPC.
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
