Pinpoint Test N: The Fog Lamps Are Inoperative
Fog Lamps
Pinpoint Tests
Pinpoint Test N: The Fog Lamps Are Inoperative
Refer to wiring Diagram Set 86, Fog Lamps for schematic and connector information. Diagrams By Number
Normal Operation
The Battery Junction Box (BJB) provides voltage to the fog lamp relay through circuit SBB31 (WH/RD). When the fog lamp switch is engaged, a voltage signal is routed to the SJB through circuit CLF21 (GY/VT). The fog lamp relay coil ground is controlled by the SJB through circuit CLF29 (BN). When the fog lamp relay is energized, voltage is routed to the fog lamps through circuit CLF12 (BN/YE).
- DTC B2030 (Front Fog Lamp Relay Ckt Failure) - a continuous and on-demand DTC that sets when the SJB detects an open from the fog lamp relay coil ground controlled circuit.
- DTC B2512 (Front Fog Lamp Relay Ckt Short to Battery) - a continuous and on-demand DTC that sets when the SJB detects a short to voltage from the fog lamp relay coil controlled circuit.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Fog lamp relay
- Headlamp switch
- SJB
PINPOINT TEST N: 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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N1 CHECK THE RECORDED DTCs FROM THE SJB SELF-TEST
NOTE: Make sure the parking lamps operate correctly before continuing diagnosis of the fog lamps.
- Ignition OFF.
- Check the recorded results from the SJB self-test.
- Is DTC B2512 or B2030 present?
Yes
For DTC B2512, GO to N2.
For DTC B2030, GO to N4.
No
GO to N7.
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N2 CHECK THE FOG LAMP RELAY (DTC B2512)
- Disconnect: Fog Lamp Relay.
- Carry out the fog lamp relay component test.
- Is the fog lamp relay OK?
Yes
GO to N3.
No
INSTALL a new fog lamp relay. 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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N3 CHECK CIRCUIT CLF29 (BN) FOR A SHORT TO VOLTAGE
- Disconnect: SJB C2280c.
- Ignition ON.
- For vehicles equipped with a 2.3L engine, measure the voltage between the fog lamp relay pin 2, circuit CLF29 (BN), BJB face side and ground.
- For vehicles equipped with a 4.0L engine, measure the voltage between the fog lamp relay pin 2, circuit CLF29 (BN), BJB face side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
No
GO to N12.
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N4 CHECK THE FOG LAMP RELAY (DTC B2030)
- Disconnect: Fog Lamp Relay.
- Carry out the fog lamp relay component test.
- Is the fog lamp relay OK?
Yes
GO to N5.
No
INSTALL a new fog lamp relay. CLEAR the DTCs. REPEAT the self-test.
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N5 CHECK CIRCUIT SBB31 (WH/RD) FOR AN OPEN (DTC B2030)
- For vehicles equipped with a 2.3L engine, measure the voltage between the fog lamp relay pin 1, circuit SBB31 (WH/RD), BJB face side and ground.
- For vehicles equipped with a 4.0L engine, measure the voltage between the fog lamp relay pin 1, circuit SBB31 (WH/RD), BJB face side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to N6.
No
VERIFY the BJB fuse 31 (15A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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N6 CHECK CIRCUIT CLF29 (BN) FOR AN OPEN
- Connect: Fog Lamp Relay.
- Disconnect: SJB C2280c.
- Measure the voltage between the SJB C2280c-21, circuit CLF29 (BN), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to N12.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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N7 CHECK THE FOG LAMP RELAY (NO DTC)
- Disconnect: Fog Lamp Relay.
- Carry out the fog lamp relay component test.
- Is the fog lamp relay OK?
Yes
GO to N8.
No
INSTALL a new fog lamp relay. TEST the system for normal operation.
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N8 CHECK CIRCUIT SBB31 (WH/RD) FOR AN OPEN (NO DTC)
- For vehicles equipped with a 2.3L engine, measure the voltage between the fog lamp relay pin 3, circuit SBB31 (WH/RD), BJB face side and ground.
- For vehicles equipped with a 4.0L engine, 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
GO to N9.
No
REPAIR the circuit. TEST the system for normal operation.
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N9 CHECK CIRCUIT CLF12 (BN/YE) FOR AN OPEN
- For vehicles equipped with a 2.3L engine, connect a fused jumper wire between the fog lamp relay pin 3, circuit SBB31 (WH/RD), BJB face side and the fog lamp relay pin 5, circuit CLF12 (BN/YE), BJB face side.
- For vehicles equipped with a 4.0L engine, connect a fused jumper wire between the fog lamp relay pin 3, circuit SBB31 (WH/RD), BJB face side and the fog lamp relay pin 5, circuit CLF12 (BN/YE), BJB face side.
- Do the fog lamps illuminate?
Yes
REMOVE the jumper wire. GO to N10.
No
REMOVE the jumper wire. REPAIR the circuit. TEST the system for normal operation.
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N10 CHECK THE INPUT FROM THE HEADLAMP SWITCH
- Connect: Fog Lamp Relay.
- Disconnect: SJB C2280d.
- Place the headlamp switch in the PARKING LAMPS ON position and engage the fog lamp switch.
- Measure the voltage between the SJB C2280d-9, circuit CLF21 (GY/VT), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to N12.
No
GO to N11.
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N11 CHECK THE HEADLAMP SWITCH
- Ignition OFF.
- Disconnect: Headlamp Switch C205.
- Carry out the headlamp switch component test.
- Is the headlamp switch OK?
Yes
REPAIR circuit CLF21 (GY/VT) for an open. TEST the system for normal operation.
No
INSTALL a new headlamp switch. REFER to Headlamp Switch Service and Repair. TEST the system for normal operation.
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N12 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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