Trailer Lamps Malfunction Holden Genuine Accessory
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using the diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category Circuit/System Description. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Turn Signal Lamps-Left Signal | 1 | 1 | 1 | -- |
Backup Lamps Signal | 3 | 3 | 3 | -- |
Ground | 1, 2, 3, 4, 5 | 1, 2, 3, 4, 5 | 1, 2, 3, 4, 5 | -- |
Turn Signal Lamps-Right Signal | 2 | 2 | 2 | -- |
Stop Lamps Signal | 4 | 4 | 4 | -- |
Park Lamps Signal | 5 | 5 | 5 | -- |
1. Left Turn Signal Lamp Malfunction. 2. Right Turn Signal Lamp Malfunction. 3. Backup Lamps Malfunction. 4. Stop Lamps Malfunction. 5. Park Lamps Malfunction. | ||||
Circuit/System Description
The trailer patch harness connectors are connected between the designated inline connectors of the exterior lighting system. This connection allows integration of the lighting system of the trailer to the exterior lighting of the vehicle. The wiring harness of the trailer lamps is connected to the vehicle through the trailer connector. Refer to Trailer Connector/Provision Component Views.
If the vehicle is fitted with a genuine Holden object detection system, the ground circuit of this system is connected to a Reed switch in the trailer connector. Opening the trailer connector cover actuates the switch to open circuit condition and disables the rear object detection system.
Diagnostic Aids
The following is a brief description of potential causes which may aid in diagnosis:
| • | Make sure to inspect the inoperative bulbs for broken filaments or corroded terminal connections. |
| • | Make sure to check connectors for correct mating and for corrosion that will prevent proper electrical connections. |
Reference Information
Schematic Reference
Trailer Connector/Provision Schematics
Connector End View Reference
Description and Operation
Exterior Lighting Systems Description and Operation
Component View Reference
Trailer Connector/Provision Component Views
Electrical Information Reference
Circuit/System Verification
Turn Signal Lamps - Left
Ignition ON, left turn signal lamps switch ON, the left turn signal lamps of the vehicle should be blinking. If the left turn signal lamps do not blink, refer to Turn Signal Lamps and/or Indicators Inoperative.
Turn Signal Lamps - Right
Ignition ON, right turn signal lamps switch ON, the right turn signal lamps of the vehicle should be blinking. If the right turn signal lamps do not blink, refer to Turn Signal Lamps and/or Indicators Inoperative.
Backup lamps
Ignition ON, park brake ON, transmission in REVERSE, the backup lamps of the vehicle should illuminate. If the backup lamps do not illuminate, refer to Backup Lamps Inoperative.
Stop lamps
Ignition ON, brake pedal pressed, the stop lamps of the vehicle should illuminate only when the brake pedal is pressed. If the stop lamps do not function correctly, refer to Stop Lamps Inoperative or Stop Lamps Always On.
Park Lamps
Ignition ON, park lamps switch ON, the park lamps of the vehicle should illuminate. If the park lamps do not illuminate, refer to Parking Lamps and Taillamps Inoperative.
Circuit/System Testing
Turn Signal Lamps - Left
- Ignition OFF, disconnect the trailer connector.
- Test for less than 1.0 ohm between the ground circuit terminal 3 and ground.
- Ignition ON, left turn signal lamp switch ON, verify that a test lamp is blinking when connected between the signal circuit terminal 1 and ground circuit terminal 3.
| ⇒ | If greater than the specified value, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp is not blinking, test the signal circuit for a short to voltage, a short to ground or an open/high resistance. |
Turn Signal Lamps - Right
- Ignition OFF, disconnect the trailer connector.
- Test for less than 1.0 ohm between the ground circuit terminal 3 and ground.
- Ignition ON, right turn signal lamp switch ON, verify that a test lamp is blinking when connected between the signal circuit terminal 4 and ground circuit terminal 3.
| ⇒ | If greater than the specified value, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp is not blinking, test the signal circuit for a short to voltage, a short to ground or an open/high resistance. |
Backup lamps
- Ignition OFF, disconnect the trailer connector.
- Test for less than 1.0 ohm between the ground circuit terminal 3 and ground.
- Ignition ON, park brake ON, transmission in REVERSE, verify that a test lamp illuminates when connected between the signal circuit terminal 2 and ground circuit terminal 3.
| ⇒ | If greater than the specified value, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. |
Stop lamps
- Ignition OFF, disconnect the trailer connector.
- Test for less than 1.0 ohm between the ground circuit terminal 3 and ground.
- Ignition ON, brake pedal pressed, verify that a test lamp illuminates when connected between the signal circuit terminal 6 and ground circuit terminal 3.
| ⇒ | If greater than the specified value, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. |
Park Lamps
- Ignition OFF, disconnect the trailer connector.
- Test for less than 1.0 ohm between the ground circuit terminal 3 and ground.
- Ignition ON, park lamps switch ON, verify that a test lamp illuminates when connected between the signal circuit terminal 7 and ground circuit terminal 3.
| ⇒ | If greater than the specified value, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. |
Repair Instructions
For component removal and installation refer to the accessory fitting instructions.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
