Pinpoint Test P: The Parking, Rear Or License Plate Lamps Are On Continuously
Parking, Rear and License Plate Lamps
Pinpoint Tests
Pinpoint Test P: The Parking, Rear Or License Plate Lamps Are On Continuously
Refer to Wiring Diagram Set 92, Parking, Rear and License Lamps for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) monitors the parking lamp request input from the headlamp switch through circuit CLS34 (GY). The SJB provides a ground for the parking lamp relay coil (integral to the SJB) when a request for the parking lamps is received. When the parking lamp relay is energized, voltage is routed through circuit CLS30 (VT/WH) to the rear and front parking lamps, and to the Battery Junction Box (BJB) fuse 23 (3A). The BJB fuse 23 (3A) routes voltage to the ambient lighting system through circuit CBB23 (BN/YE).
- DTC B1578 (Lamp Park Input Circuit Short to Ground) - an on-demand DTC that may set when the SJB detects a short to ground in the parking lamps on input circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Headlamp switch
- SJB
PINPOINT TEST P: THE PARKING, REAR OR LICENSE PLATE LAMPS ARE ON CONTINUOUSLY
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P1 USE THE RECORDED DTCs FROM THE SJB SELF-TEST
- Check the recorded results from the SJB self-test.
- Was DTC B1578 recorded?
Yes
GO to P2.
No
GO to P4.
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P2 CHECK THE HEADLAMP SWITCH
- Ignition OFF.
- Disconnect: Headlamp Switch C205.
- Carry out the headlamp switch component test.
- Is the headlamp switch OK?
Yes
GO to P3.
No
INSTALL a new headlamp switch. REFER to Headlamp Switch Service and Repair. CLEAR the DTCs. REPEAT the self-test.
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P3 CHECK CIRCUIT CLS34 (GY) FOR A SHORT TO GROUND
- Disconnect: SJB C2280b.
- Measure the resistance between the headlamp switch C205-3, circuit CLS34 (GY), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to P6.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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P4 CHECK CIRCUIT CLS30 (VT/WH) FOR A SHORT TO VOLTAGE (TO REAR LAMPS)
- Ignition OFF.
- Disconnect: SJB C2280d.
- Ignition ON.
- Do the rear parking lamps continue to illuminate?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
GO to P5.
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P5 CHECK CIRCUIT CLS30 (VT/WH) FOR A SHORT TO VOLTAGE (TO FRONT LAMPS)
- Ignition OFF.
- Disconnect: SJB C2280e.
- Ignition ON.
- Do the front parking lamps continue to illuminate?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
GO to P6.
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P6 CHECK FOR CORRECT SJB OPERATION
- Ignition OFF.
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new SJB. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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