Pinpoint Test P: One Or More Parking, Rear Or License Plate Lamps Is Inoperative
Parking, Rear and License Plate Lamps
Pinpoint Tests
Pinpoint Test P: One Or More Parking, Rear or License Plate Lamps Is Inoperative
Refer to Wiring Diagram Set 92, Parking, Rear and License Lamps for schematic and connector information. Diagrams By Number
Normal Operation
The Central Junction Box (CJB) fuse 132 (10A) provides voltage at all times to the headlamp switch. When the headlamp switch is placed in the PARKING LAMPS ON position, the headlamp switch routes voltage on 2 separate circuits back to the CJB. One circuit is for the front and rear parking lamps and the other is for the license plate lamps. The voltage passes through CJB fuses 156 (7.5A) (LH parking lamps), 175 (7.5A) (RH parking lamps) and 157 (7.5A) (license plate lamps) to the parking and license plate lamps.
The license plate lamps share a common ground circuit.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Headlamp switch
- Rear lamp jumper harness
- Headlamp assembly
PINPOINT TEST P: ONE OR MORE PARKING, REAR OR LICENSE PLATE LAMPS IS 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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P1 DETERMINE IF ALL THE PARKING LAMPS ARE INOPERATIVE
- Ignition OFF.
- Place the headlamp switch in the PARKING LAMPS ON position.
- Are all the parking lamps inoperative?
Yes
PLACE the headlamp switch in the OFF position. VERIFY the CJB fuse 132 (10A) is OK. If OK, GO to P2. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number
No
If both license plate lamps are inoperative, GO to P3. If the front and rear parking lamps are inoperative, GO to P6. If all the LH parking lamps are inoperative, VERIFY the CJB fuse 175 (7.5A) is OK. If OK, REPAIR the circuit 29S-LF1 (OG/YE) 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. If all the RH parking lamps are inoperative, VERIFY the CJB fuse 156 (7.5A) is OK. If OK, REPAIR the circuit 29S-LF1 (OG/YE) 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. For all other individual lamp concerns, GO to P7. Diagrams By Number
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P2 CHECK FOR VOLTAGE TO THE HEADLAMP SWITCH
- Disconnect: Headlamp Switch C205.
- Measure the voltage between the headlamp switch C205-11, circuit 29-LE29 (OG/BK), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
INSTALL a new headlamp switch. REFER to Headlamp Switch Service and Repair. TEST the system for normal operation.
No
REPAIR circuit 29-LE29 (OG/BK) for an open. TEST the system for normal operation.
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P3 CHECK FOR VOLTAGE TO THE LICENSE PLATE LAMPS
- Disconnect: LH License Plate Lamp C452.
- Measure the voltage between the LH license plate lamp C452-2, circuit 29S-LF21 (OG/BK), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
REPAIR the license plate lamps ground circuit. TEST the system for normal operation.
No
VERIFY the CJB fuse 157 (7.5A) is OK. If OK, GO to P4. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number
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P4 BYPASS THE HEADLAMP SWITCH (LICENSE PLATE LAMPS)
- Connect: LH License Plate Lamp C452.
- Disconnect: Headlamp Switch C205.
- Connect a fused jumper wire between the headlamp switch C202-11, circuit 29-LE29 (OG/BK), harness side and the headlamp switch C202-16, circuit 29S-LF5 (OG/BU), harness side.
- Do the license plate lamps illuminate?
Yes
REMOVE the jumper wire. INSTALL a new headlamp switch. REFER to Headlamp Switch Service and Repair. TEST the system for normal operation.
No
LEAVE the jumper wire connected. GO to P5.
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P5 CHECK FOR VOLTAGE TO THE CJB FUSE 157 (7.5A)
NOTE: Make sure the CJB fuse 157 (7.5A) is installed and probed through one of the fuse openings.
- Measure the voltage between the CJB fuse 157 (7.5A) and ground.
- Is the voltage greater than 10 volts?
Yes
REMOVE the jumper wire. REPAIR circuit 29S-LF21 (OG/BK) for an open. TEST the system for normal operation.
No
REMOVE the jumper wire. REPAIR circuit 29S-LF5 (OG/BU) for an open. TEST the system for normal operation.
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P6 BYPASS THE HEADLAMP SWITCH (FRONT AND REAR PARKING LAMPS)
- Disconnect: Headlamp Switch C205.
- Connect a fused jumper wire between the headlamp switch C202-11, circuit 29-LE29 (OG/BK), harness side and the headlamp switch C202-13, circuit 29S-LF1 (OG/YE), harness side.
- Do the front and rear parking lamps illuminate?
Yes
REMOVE the jumper wire. INSTALL a new headlamp switch. REFER to Headlamp Switch Service and Repair. TEST the system for normal operation.
No
REMOVE the jumper wire. REPAIR circuit 29S-LF1 (OG/YE) for an open. TEST the system for normal operation.
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P7 CHECK FOR VOLTAGE TO THE INOPERATIVE LAMP
- Place the headlamp switch in the OFF position.
- Disconnect: Inoperative Lamp.
- Place the headlamp switch in the PARKING LAMPS ON position.
- Measure the voltage between the inoperative lamp, harness side and ground as follows:
- Is the voltage greater than 10 volts?
Yes
For a side marker lamp, REPAIR the ground circuit for an open. TEST the system for normal operation. For all other lamps, GO to P8.
No
REPAIR the voltage supply circuit for an open. TEST the system for normal operation.
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P8 CHECK FOR VOLTAGE TO THE INOPERATIVE LAMP USING THE CONNECTOR GROUND
- Measure the voltage between the inoperative lamp, harness side as follows:
- Is the voltage greater than 10 volts?
Yes
For a front lamp, REPAIR or INSTALL a new headlamp assembly. REFER to Headlamp Assembly Service and Repair. TEST the system for normal operation. For a rear lamp, REPAIR or INSTALL a new rear lamp jumper harness. TEST the system for normal operation. For a license plate lamp, INSTALL a new license plate lamp. REFER to License Plate Lamp Service and Repair. TEST the system for normal operation.
No
REPAIR the ground circuit in question for an open. TEST the system for normal operation.
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