Pinpoint Test S: The Parking, Rear Or License Plate Lamps Are On Continuously
Parking, Rear and License Plate Lamps
Pinpoint Test S: 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) sends a voltage signal to the headlamp switch to monitor the parking lamp request input. When the headlamp switch is placed in the PARKING LAMPS ON position, the voltage signal is routed to ground.
The SJB (Smart Junction Box) provides a ground for the parking lamp relay coil (integrated into the SJB (Smart Junction Box)) when a request for the parking lamps is received. When the parking lamp relay is energized, voltage is provided to the rear and front parking lamps.
- DTC B1578 (Lamp Park Input Circuit Short to Ground)- an on-demand DTC that sets when the SJB (Smart Junction Box) detects a short to ground from the parking lamps on input circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Headlamp switch
- SJB (Smart Junction Box)
PINPOINT TEST S : THE PARKING, REAR OR LICENSE PLATE LAMPS ARE ON CONTINUOUSLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
S1 USE THE RECORDED DTCs FROM THE SJB (Smart Junction Box) SELF-TEST
- Check the recorded results from the SJB (Smart Junction Box) self-test.
Was DTC B1578 recorded?
Yes
GO to S2.
No
GO to S4.
S2 CHECK FOR A VOLTAGE SIGNAL TO THE HEADLAMP SWITCH
- Ignition OFF.
- Disconnect: Headlamp Switch C205.
- Measure the voltage between the headlamp switch C205-2, circuit CLS34 (GY), harness side and ground.
Is the voltage greater than 10 volts?
Yes
INSTALL a new headlamp switch. REFER to Headlamp Switch . CLEAR the DTCs. REPEAT the self-test.
No
GO to S3.
S3 CHECK THE PARKING LAMP REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND
- Disconnect: SJB (Smart Junction Box) C2280B.
- Measure the resistance between the headlamp switch C205-2, circuit CLS34 (GY), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to S6.
No
REPAIR circuit CLS34 (GY) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
S4 CHECK THE REAR PARKING LAMPS VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB (Smart Junction Box) C2280D.
- Ignition ON.
Do the rear parking lamps continue to illuminate?
Yes
REPAIR circuit CLS30 (VT/WH) for a short to voltage. TEST the system for normal operation.
No
GO to S5.
S5 CHECK THE FRONT PARKING LAMPS VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB (Smart Junction Box) C2280E.
- Ignition ON.
Do the front parking lamps continue to illuminate?
Yes
REPAIR circuit CLS30 (VT/WH) for a short to voltage. TEST the system for normal operation.
No
GO to S6.
S6 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION
- Disconnect all the SJB (Smart Junction Box) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB (Smart Junction Box) 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 (Smart Junction Box). 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.