Park, License, and/or Tail Lamps Malfunction North America
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 |
|---|---|---|---|---|
Park Lamp Switch ON Signal | 2 | 2 | 2 | -- |
LT/POS/LP Relay Control | 1 | 1 | B2585 00 | -- |
License Lamp Control | 1 | 1 | 1 | -- |
Park Lamp Control | 1 | 1 | 1 | -- |
License Lamp Ground | -- | 1 | -- | -- |
Park Lamps - LF Ground | -- | 1 | -- | -- |
Park Lamps - RF Ground | -- | 1 | -- | -- |
Tail/Stop and Turn Signal Lamps - LR Ground | -- | 1 | -- | -- |
Tail/Stop and Turn Signal Lamps - RR Ground | -- | 1 | -- | -- |
Turn Signal/Multifunction Switch Ground | -- | 2 | -- | -- |
1. Park, License, and/or Tail Lamps Malfunction 2. Park Lamp Switch Malfunction | ||||
Circuit/System Description
Battery positive voltage is applied at all times to both the coil and switch sides of the LT/POS/LP relay located in the rear fuse block. The turn signal/multifunction switch is suppled with ground at G200 at all times. When the headlamp switch is placed in either the HEAD or PARK position, ground is applied to the park lamp signal circuit to the body control module (BCM). The BCM responds by applying ground to the park lamp relay control circuit. This energizes the park lamp relay coil causing the relay switch contacts to close allowing battery voltage to flow through the LT/POS/LP and RT/POS/LP fuses to all of the park, tail, license, and marker lamps.
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, observe the scan tool Park Lamp Switch parameter while cycling the park lamp switch ON and OFF. The parameter should change between Active and Inactive.
| ⇒ | If the parameter does not change between the commanded states, refer to Park Lamp Switch Malfunction. |
| ⇒ | If the parameter changes between the commanded states, refer to Park, License, and/or Tail Lamps Malfunction. |
Circuit/System Testing
Park Lamp Switch Malfunction
- Ignition OFF, disconnect the X1 harness connector at the turn signal/multifunction switch.
- Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal 9.
- Ignition ON, verify the scan tool Park Lamp Switch parameter is Inactive.
- Install a 3A fused jumper wire between the signal circuit terminal 6 and ground. Verify the scan tool Park Lamp Switch parameter is Active.
- If all circuits test normal, test or replace the turn signal/multifunction switch.
| ⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
Park, License, and/or Tail Lamps Malfunction
- Ignition OFF, remove the fuse of the inoperative park/marker lamps and inspect.
- Install the fuse.
- Ignition OFF, disconnect the LT/POS/LP relay.
- Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground.
- Disconnect the harness connector at the inoperative park/license/marker lamp.
- Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit and ground.
- Connect the harness connector at the inoperative park/license/marker lamp.
- Connect a 20A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the park/marker lamps illuminate.
- Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.
- Command the Park Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If all circuits test normal, test or replace the park lamp relay.
| ⇒ | If the fuse is OPEN, test the control circuit of the blown fuse for a short to ground. |
| ⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the park lamp relay. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the park/marker lamps do not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, replace the inoperative park/license/marker lamp. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
Park, License, and/or Tail Lamps Malfunction European
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 |
|---|---|---|---|---|
Park Lamp Switch ON Signal | 2 | 2 | 2 | -- |
LT/POS/LP Relay Control | 1 | 1 | B2590 00 | -- |
RT/POS/LP Relay Control | 1 | 1 | B2595 00 | -- |
Park Lamp Relay Control | 1 | 1 | 1 | -- |
License Lamp Control | 1 | 1 | 1 | -- |
Park Lamp Control | 1 | 1 | 1 | -- |
License Lamp Ground | -- | 1 | -- | -- |
Park Lamp Relay Ground | -- | 1 | -- | -- |
Park Lamps - LF Ground | -- | 1 | -- | -- |
Park Lamps - RF Ground | -- | 1 | -- | -- |
Tail/Stop and Turn Signal Lamps - LR Ground | -- | 1 | -- | -- |
Tail/Stop and Turn Signal Lamps - RR Ground | -- | 1 | -- | -- |
Turn Signal/Multifunction Switch Ground | -- | 2 | -- | -- |
1. Park, License, and/or Tail Lamps Malfunction 2. Park Lamp Switch Malfunction | ||||
Circuit/System Description
Battery positive voltage is applied at all times to both the coil and switch sides of the LT/POS/LP and RT/POS/LP relays located in the rear fuse block. The turn signal/multifunction switch is suppled with ground at G200 at all times. When the headlamp switch is placed in either the HEAD or PARK position, ground is applied to the park lamp signal circuit to the body control module (BCM). The BCM responds by applying ground to the left and right park lamp relay control circuits. This energizes the left and right park lamp relay coils causing the relay switch contacts to close allowing battery voltage to flow through the LT/POS/LP and RT/POS/LP fuses to all of the park, tail, license, and marker lamps.
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, observe the scan tool Park Lamp Switch parameter while cycling the park lamp switch between the ON and OFF positions. The parameter should change between Active and Inactive.
- Ignition ON, park lamps ON, observe all park/license/marker lamps and license lamps. All park/license/marker lamps should be illuminated.
| ⇒ | If the parameter does not change between the commanded states, refer to Park Lamp Switch Malfunction. |
| ⇒ | If all park lamps are inoperative, refer to Park, Marker, and/or Tail Lamps Malfunction. |
| ⇒ | If only the license lamps are inoperative, refer to License Lamps Malfunction. |
Circuit/System Testing
Park Lamp Switch Malfunction
- Ignition OFF, disconnect the X1 harness connector at the turn signal/multifunction switch.
- Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal 9.
- Ignition ON, verify the scan tool Park Lamp Switch parameter is Inactive.
- Install a 3A fused jumper wire between the signal circuit terminal 6 and ground. Verify the scan tool Park Lamp Switch parameter is Active.
- If all circuits test normal, test or replace the turn signal/multifunction switch.
| ⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
Park, Marker, and/or Tail Lamps Malfunction
- Ignition OFF, remove the fuse of the inoperative park/marker lamps and inspect.
- Install the fuse.
- Ignition OFF, disconnect the appropriate position lamp relay.
- Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground.
- Disconnect the harness connector at the inoperative park/marker lamp.
- Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit and ground.
- Connect the harness connector at the inoperative park/marker lamp.
- Connect a 10A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the appropriate park/marker lamps illuminate.
- Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.
- Command the Park Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If all circuits test normal, test or replace the appropriate position lamp relay.
| ⇒ | If the fuse is OPEN, test the B+ circuit of the blown fuse for a short to ground. |
| ⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the appropriate position lamp relay. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the park/marker lamps do not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, replace the inoperative park/marker lamp. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
License Lamps Malfunction
- Ignition OFF, disconnect the park lamp relay.
- Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit terminal A1 and ground
- Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal A2 and ground.
- Ignition ON, park lamps ON, verify that a test lamp illuminates between the B+ circuit terminal C1 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal C2 and ground.
- Disconnect the harness connector at the inoperative license lamp.
- Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit terminal 2 and ground.
- Connect the harness connector at the inoperative license lamp.
- Connect a 10A fused jumper wire between the B+ circuit terminal C1 and the control circuit terminal A2.
- Ignition ON, park lamps ON, verify the license lamps illuminate.
- If all circuits test normal, test or replace the park lamp relay.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal A2 for a short to ground. If the circuit tests normal, test or replace the park lamp relay. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the license lamps do not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, replace the inoperative license lamp. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
