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 |
|---|---|---|---|---|
B+, Turn Signal Multifunction Switch | 7 | 7 | -- | -- |
Ignition, Turn Signal Multifunction Switch | 1 | 1 | -- | -- |
Turn Hazard Module 2 Supply Voltage | 1, 7 | 1, 7 | 2 | -- |
Turn Hazard Module Signal | 1, 7 | 1, 7 | 2 | -- |
Ground -- Turn Signal Hazard Flasher Module | -- | 1, 7 | -- | -- |
Left Front Turn Signal Lamp Supply Voltage | 1, 7 | 3 | 2 | -- |
Ground -- Left Front Turn Signal Lamp | -- | 3 | -- | -- |
Right Front Turn Signal Lamp Supply Voltage | 1, 7 | 4 | 2 | -- |
Ground -- Right Front Turn Signal Lamp | -- | 4 | -- | -- |
Left Rear Stop/Turn Lamp Supply Voltage | 1, 7 | 5 | 2 | -- |
Ground -- Left Tail Lamp Assembly | -- | 5 | -- | -- |
Right Rear Stop/Turn Lamp Supply Voltage | 1, 7 | 6 | 2 | -- |
Ground -- Right Tail Lamp Assembly | -- | 6 | -- | -- |
1. Turn signals are inoperative 2. Turn signals are always ON 3. Left front turn signal is inoperative 4. Right front turn signal is inoperative 5. Left rear turn signal is inoperative 6. Right rear turn signal is inoperative 7. Hazard flashers are inoperative | ||||
Circuit/System Description
Hazard flashers are activated by pressing the hazard switch located in the turn signal multifunction switch. When the hazard switch is pressed, B+ is applied through the hazard switch, the turn signal hazard flasher module, then back to the turn signal multifunction switch. This voltage is then distributed through the turn signal multifunction switch to all four turn signal supply voltage circuits illuminating all four turn signals and both instrument panel cluster (IPC) turn signal indicators.
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, command left and right turn signals ON and OFF using the turn signal multifunction switch. The IPC turn signal indicators and exterior turn signals should turn ON and OFF when changing between commanded states.
- Observe the hazard flashers while turning the hazard flashers ON and OFF. The hazard flashers should cycle ON and OFF while in the active state, then turn OFF when in the inactive state.
| ⇒ | If the system does not perform as specified, refer to Turn Signal Lamps and/or Indicators Malfunction . |
| ⇒ | If hazard lamps continuously flash, replace the turn signal multifunction switch. |
| ⇒ | If the hazard flashers do not turn ON as specified, refer to Circuit/System Testing. |
Circuit/System Testing
- Ignition OFF, disconnect the X201 inline harness connector.
- Verify that a test lamp illuminates between the B+ circuit terminal E8 and ground.
- Connect the X201 inline harness connector and disconnect the harness connector at the turn signal hazard flasher module.
- Connect a test lamp between the control circuit terminal 2 and ground.
- Activate the hazard flasher switch. The test lamp should illuminate.
- If all circuits test normal, test or replace the turn signal multifunction switch.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, test or place the turn signal multifunction switch. |
Component Testing
- Ignition OFF, disconnect the turn signal multifunction switch.
- With the switch in OFF position, test for infinite resistance between control circuit terminal E8 and control circuit terminal E1.
- With the switch in ON position, test for less than 2.0 ohms between control circuit terminal E8 and control circuit terminal E1.
| ⇒ | If less than the specified range, replace the turn signal multifunction switch. |
| ⇒ | If greater than the specified range, replace the turn signal multifunction switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
