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Pinpoint Test Q: The Fog Lamps Are Inoperative




Fog Lamps

Pinpoint Tests

Pinpoint Test Q: The Fog Lamps Are Inoperative

Refer to Wiring Diagram Set 86, Fog Lamps for schematic and connector information. Diagrams By Number

Normal Operation

The Smart Junction Box (SJB) sends a voltage signal to the headlamp switch. When the fog lamp switch is engaged, the voltage signal is routed to ground.

Voltage is supplied to the switched side of the fog lamp relay from the Battery Junction Box (BJB) fuse 31 (15A).

When the SJB detects the fog lamp on request, the SJB provides a voltage to the fog lamp relay coil. When the fog lamp relay is energized, voltage is routed to the fog lamps.

- DTC B2030 (Front Fog Lamp Relay Ckt Failure) - a continuous and on-demand DTC that sets when the SJB detects a short to ground from the fog lamp relay coil ground controlled circuit. The self-test must be run after the repair in order for the SJB to enable the output for the fog lamp voltage supply.
- DTC B2512 (Front Fog Lamp Relay Ckt Short to Battery) - a continuous and on-demand DTC that sets when the SJB detects an open from the fog lamp relay coil voltage supply circuit.

This pinpoint test is intended to diagnose the following:

- Fuse
- Wiring, terminals or connectors
- Fog lamp relay
- Headlamp switch
- SJB



PINPOINT TEST Q: THE FOG LAMPS ARE INOPERATIVE

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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Q1 CHECK THE HEADLAMP SWITCH PID


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Monitor the SJB headlamp switch PID (FOG SW) while engaging the fog lamp switch.
- Does the PID agree with the headlamp switch position?

Yes
GO to Q4.

No
GO to Q2.

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Q2 CHECK FOR VOLTAGE TO THE HEADLAMP SWITCH


- Ignition OFF.
- Disconnect: Headlamp Switch C205.
- Ignition ON.
- Measure the voltage between the headlamp switch C205-6, circuit CLF18 (BU/WH), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
INSTALL a new headlamp switch. REFER to Headlamp Switch Service and Repair. CLEAR the DTCs. REPEAT the self-test.

No
GO to Q3.

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Q3 CHECK THE FOG LAMP REQUEST INPUT CIRCUIT FOR AN OPEN


- Disconnect: SJB C2280d.
- Measure the resistance between the headlamp switch C205-6, circuit CLF21 (GY/VT), harness side and the SJB C2280d-12, circuit CLF21 (GY/VT), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to Q13.

No
REPAIR circuit CLF21 (GY/VT) for an open. CLEAR the DTCs. REPEAT the self-test.

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Q4 CHECK THE RECORDED DTCs FROM THE SJB SELF-TEST


- Check the recorded results from the SJB self-test.
- Is DTC B2030 or DTC B2512 present?

Yes
For DTC B2030, GO to Q5.

For DTC B2512, GO to Q8.

No
GO to Q11.

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Q5 CHECK THE FOG LAMP RELAY (DTC B2030)


- Disconnect: Fog Lamp Relay.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test.
- NOTE: DTC B2512 can be present and should be ignored.
- Repeat the SJB self-test.
- Is DTC B2030 retrieved again?

Yes
GO to Q6.

No
INSTALL a new fog lamp relay. CLEAR the DTCs. REPEAT the self-test.

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Q6 CHECK THE HEADLAMP SWITCH (DTC B2030)


- Disconnect: Headlamp Switch C205.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test.
- NOTE: Other DTCs can be present and should be ignored.
- Repeat the SJB self-test.
- Is DTC B2030 retrieved again?

Yes
GO to Q7.

No
INSTALL a new headlamp switch. REFER to Headlamp Switch Service and Repair. CLEAR the DTCs. REPEAT the self-test.

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Q7 CHECK THE SJB FOG LAMP RELAY/ FOG LAMPS ON INDICATOR OUTPUT CIRCUIT FOR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: SJB C2280d and C2280e.
- Measure the resistance between the SJB C2280e-7, circuit CLF28 (BN/WH), harness side and ground; and between the SJB C2280d-28, circuit CLF28 (BN/WH), harness side and ground.




- Are resistances greater than 10,000 ohms?

Yes
GO to Q13.

No
REPAIR the circuit in question for a short to ground. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

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Q8 CHECK THE FOG LAMP RELAY (DTC B2512)


- Disconnect: Fog Lamp Relay.
- Substitute a known good relay.
- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Command the SJB fog lamp active command (FOG_LMP) on and then off.
- Do the fog lamps illuminate when commanded on?

Yes
REMOVE the known good relay. INSTALL a new fog lamp relay. CLEAR the DTCs. REPEAT the self-test.

No
REMOVE the known good relay. GO to Q9.

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Q9 CHECK FOR VOLTAGE TO THE FOG LAMP RELAY COIL


- Measure the voltage between the fog lamp relay pin 2, circuit CLF28 (BN/WH), BJB face side and ground.




- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Command the SJB fog lamp active command (FOG_LMP) on and then off.
- Is the voltage greater than 10 volts when the fog lamps are commanded on?

Yes
REPAIR circuit GD120 (BK/GN) for an open. CLEAR the DTCs. REPEAT the self-test.

No
GO to Q10.

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Q10 CHECK THE SJB FOG LAMP RELAY COIL VOLTAGE CIRCUIT FOR AN OPEN


- Ignition OFF.
- Disconnect: SJB C2280e.
- Measure the resistance between the fog lamp relay pin 2, circuit CLF28 (BN/WH), BJB face side and the SJB C2280e-7, circuit CLF28 (BN/WH), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to Q13.

No
REPAIR circuit CLF28 (BN/WH) for an open. CLEAR the DTCs. REPEAT the self-test.

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Q11 CHECK THE FOG LAMP RELAY (NO DTCs)


- Disconnect: Fog Lamp Relay.
- Substitute a known good relay.
- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Command the SJB fog lamp active command (FOG_LMP) on and then off.
- Do the fog lamps illuminate when commanded on?

Yes
REMOVE the known good relay. INSTALL a new fog lamp relay. TEST the system for normal operation.

No
REMOVE the known good relay. GO to Q12.

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Q12 CHECK FOR VOLTAGE TO THE FOG LAMP RELAY


- Ignition OFF.
- Measure the voltage between the fog lamp relay pin 3, circuit SBB31 (WH/RD), BJB face side and ground.




- Is the voltage greater than 10 volts?

Yes
REPAIR circuit CLF12 (BN/YE) for an open. TEST the system for normal operation.

No
VERIFY the BJB fuse 31 (15A) is OK. If OK, REPAIR circuit SBB31 (WH/RD) for an open. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number

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Q13 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 Body Control Systems. 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 any DTCs. REPEAT the self-test.

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