Pinpoint Test G: The Headlamps Do Not Illuminate When the Wipers are On

Wipers and Washers

Pinpoint Test G: The Headlamps Do Not Illuminate When the Wipers are On

Refer to Wiring Diagram Set 81, Front Wipers and Washers for schematic and connector information. Diagrams By Number

Normal Operation

The Smart Junction Box (SJB) monitors the status of the wipers through circuit CRW01 (WH). When the headlamp control switch is in the AUTOLAMP position and the wipers are on, the wiper motor module will pull the voltage reference signal low. Within 10 seconds, the SJB (Smart Junction Box) will activate the headlamps.

- DTC B2008 (Wipers On Signal Circuit Short to Ground)- Sets when a short to ground is detected on the wiper motor status input circuit.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Wiper motor

- SJB (Smart Junction Box)

PINPOINT TEST G : THE HEADLAMPS DO NOT ILLUMINATE WHEN THE WIPERS ARE ON

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

G1 CHECK THE WIPER MOTOR ON INPUT VOLTAGE TO THE WINDSHIELD WIPER MOTOR

- Disconnect: Wiper Motor C125.

- Ignition ON.

- Turn the headlamp control switch to the AUTOLAMP position.

- Measure the voltage between wiper motor C125-2, circuit CRW01 (WH), harness side and ground.





Is the voltage greater than 10 volts?

Yes
GO to G3.

No
GO to G2.

G2 CHECK CIRCUIT CRW01 (WH) FOR AN OPEN OR SHORT TO GROUND

- Ignition OFF.

- Disconnect: SJB (Smart Junction Box) C2280F.

- Measure the resistance between SJB (Smart Junction Box) C2280F-8, circuit CRW01 (WH), harness side and wiper motor C125-2, circuit CRW01 (WH); and between SJB (Smart Junction Box) C2280F-8, circuit CRW01 (WH), harness side and ground.





Is the resistance less than 5 ohms between the SJB (Smart Junction Box) and wiper motor and greater than 10,000 ohms between the SJB (Smart Junction Box) and ground?

Yes
GO to G4.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

G3 CHECK THE WIPER ACTIVATED HEADLAMPS OPERATION

- NOTE: When performing the following test, the light sensor must have enough light to have the headlamps deactivated.
Connect a fused jumper wire between wiper motor C125-2 circuit CRW01 (WH), harness side and ground.






Do the headlamps turn on within 10 seconds?

Yes
INSTALL a new wiper motor. REFER to Wiper Motor . CLEAR the DTCs. REPEAT the self-test.

No
GO to G4.

G4 CHECK FOR CORRECT MODULE OPERATION

- Disconnect all the SJB (Smart Junction Box) connectors.

- Check for:
- corrosion.

- pushed-out pins.


- Connect all the SJB (Smart Junction Box) connectors and make sure they are seated correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new SJB (Smart Junction Box). CLEAR the DTCs. REPEAT the self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.