Pinpoint Test M: The Parking, Rear And License Plate Lamps Are Always On
Parking, Rear and License Plate Lamps
Pinpoint Tests
Pinpoint Test M: The Parking, Rear And License Plate Lamps Are Always On
Refer to Wiring Diagram Set 92, Parking, Rear and License Lamps for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 95, Trailer/Camper Adapter for schematic and connector information. Diagrams By Number
Normal Operation
The parking lamp relay is integrated into, and controlled by, the Smart Junction Box (SJB). When the headlamp switch is placed in the PARKING LAMPS ON position, the headlamp switch routes voltage to the SJB. When the SJB receives the voltage signal from the headlamp switch, the parking lamp relay is energized and voltage is routed to the parking lamps, the trailer tow connector and the instrument panel dimmer switch.
- DTC B2261 (Park Lamp Switch Failure) - an on-demand DTC that sets when the SJB detects a short to voltage from the parking lamps on request input circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Headlamp switch
- SJB
PINPOINT TEST M: THE PARKING, REAR AND LICENSE PLATE LAMPS ARE ALWAYS ON
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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M1 CHECK THE RECORDED DTCs FROM THE SJB SELF-TEST
- Ignition OFF.
- Check the recorded results from the SJB self-test.
- Is DTC B2261 present?
Yes
GO to M2.
No
GO to M4.
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M2 CHECK THE HEADLAMP SWITCH
- Disconnect: Headlamp Switch C205.
- Do the parking lamps continue to illuminate?
Yes
GO to M3.
No
INSTALL a new headlamp switch. REFER to Headlamp Switch Service and Repair. TEST the system for normal operation.
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M3 CHECK THE HEADLAMP SWITCH OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: SJB C2280d.
- Measure the voltage between the headlamp switch C205-5, circuit CLS30 (VT/WH), harness side and ground.
- Is any voltage present?
Yes
REPAIR circuit CLS30 (VT/WH) for a short to voltage. TEST the system for normal operation.
No
GO to M8.
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M4 CHECK THE SJB FRONT PARKING LAMPS OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: SJB C2280a.
- Do the front parking lamps continue to illuminate?
Yes
REPAIR circuit CLS34 (GY) for a short to voltage. TEST the system for normal operation.
No
GO to M5.
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M5 CHECK THE SJB REAR PARKING LAMPS OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: SJB C2280c.
- Do the rear parking lamps continue to illuminate?
Yes
REPAIR circuit CLS34 (GY) for a short to voltage. TEST the system for normal operation.
No
GO to M6.
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M6 CHECK THE TRAILER TOW PARKING LAMP CIRCUIT FOR A SHORT TO VOLTAGE
- Measure the voltage between the trailer tow C439-3, circuit CAT17 (BN/WH), harness side and ground.
- Is any voltage present?
Yes
REPAIR circuit CAT17 (BN/WH) for a short to voltage. TEST the system for normal operation.
No
GO to M7.
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M7 CHECK THE DIMMER SWITCH VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: Instrument Panel Dimmer Switch C2065.
- Measure the voltage between the SJB C2280c-26, circuit CBP01 (BU), harness side and ground.
- Is any voltage present?
Yes
REPAIR circuit CBP01 (BU) for a short to voltage. TEST the system for normal operation.
No
GO to M8.
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M8 CHECK FOR CORRECT SJB OPERATION
- 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. REFER to Multifunction Electronic Modules Service and Repair. 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.
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