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Pinpoint Test N: One Or More Parking, Rear Or License Plate Lamp Is Inoperative




Parking, Rear and License Plate Lamps

Pinpoint Tests

Pinpoint Test N: One Or More Parking, Rear Or License Plate Lamp Is Inoperative

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 reference signal to the headlamp switch through circuit 1401 (BK/LG). When the headlamp switch is placed in the PARKING LAMPS ON position, the SJB provides voltage to the parking, rear, license plate and side marker lamps. The lamps are grounded through circuit 1205 (BK).

B2035-B2523:





This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Bulb holder
- BEC
- SJB



PINPOINT TEST N: ONE OR MORE PARKING, REAR OR LICENSE PLATE LAMP IS INOPERATIVE

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

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.

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N1 CHECK THE STOPLAMP OPERATION


- Ignition OFF.
- Apply and release the brake pedal while observing the stoplamps.
- Do the stoplamps operate correctly?

Yes
GO to N2.

No
REFER to Stoplamps Testing and Inspection.

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N2 CHECK THE TURN SIGNAL OPERATION


- Ignition ON.
- Place the multifunction switch in the LH and then RH TURN position.
- Do the turn lamps operate correctly?

Yes
GO to N3.

No
REFER to Turn Signal and Hazard Lamps Testing and Inspection.

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N3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN


NOTE: Make sure the bulb is good before continuing diagnostics.

- Ignition OFF.
- Disconnect: Inoperative Parking Lamp.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the inoperative parking lamp, harness side and ground as follows:





- Is the resistance less than 5 ohms?

Yes
For a side marker or front lamp, GO to N5.

For a rear or license plate lamp, GO to N6.

No
For a front side marker lamp, GO to N4.

For all others, REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

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N4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN (SIDE LAMP TO BEC)


- Disconnect: BEC C1035c.
- Measure the resistance between the LH front side marker C151-2, circuit 1205 (BK), harness side and the BEC C1035c-F3, circuit 1205 (BK), harness side; or between the RH front side marker C161-2, circuit 1205 (BK), harness side and the BEC C1035c-F10, circuit 1205 (BK), harness side.




- Is the resistance less than 5 ohms?

Yes
INSTALL a new BEC. CLEAR the DTCs. REPEAT the self-test.

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

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N5 CHECK FOR VOLTAGE TO THE BULB HOLDER


- Connect: Negative Battery Cable.
- Place the headlamp switch in the PARKING LAMPS ON position.
- Measure the voltage between the inoperative parking lamp, harness side and ground as follows:





- Is the voltage greater than 10 volts?

Yes
INSTALL a new bulb holder. CLEAR the DTCs. REPEAT the self-test.

No
GO to N6.

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N6 CHECK THE PARKING LAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO GROUND


NOTE: If testing at a rear side marker lamp, both rear side marker lamps must be disconnected for correct test results.

NOTE: If testing at the rear lamp 1 or rear lamp 2, both lamps must be disconnected for correct test results.

- Connect: Negative Battery Cable.
- Place the headlamp switch in the OFF position.
- Disconnect: SJB C2280d.
- Measure the resistance between the inoperative parking lamp, harness side and ground as follows:





- Is the resistance greater than 10,000 ohms?

Yes
GO to N9.

No
For a front lamp or front side marker, GO to N7.

For all others, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

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N7 CHECK THE PARKING LAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO GROUND (BEC TO SJB)


- Disconnect: BEC C1035a.
- Measure the resistance between the inoperative parking lamp, harness side and ground as follows:





- Is the resistance greater than 10,000 ohms?

Yes
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

No
GO to N8.

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N8 CHECK THE PARKING LAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO GROUND (BEC TO FRONT LAMP)


- Disconnect: BEC C1035c.
- Measure the resistance between the inoperative parking lamp, harness side and ground as follows:





- Is the resistance greater than 10,000 ohms?

Yes
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

No
INSTALL a new BEC. CLEAR the DTCs. REPEAT the self-test.

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N9 CHECK THE PARKING LAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN (SJB TO LAMP)


- Measure the resistance between the inoperative parking lamp, harness side and the SJB harness side as follows:





- Is the resistance less than 5 ohms?

Yes
GO to N12.

No
For a front lamp or front side marker, GO to N10.

For all others, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

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N10 CHECK THE PARKING LAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN (SJB TO BEC)


- Disconnect: BEC C1035a.
- Measure the resistance between the BEC, harness side and the SJB, harness side as follows:





- Is the resistance less than 5 ohms?

Yes
GO to N11.

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

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N11 CHECK THE PARKING LAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN (BEC TO LAMP)


- Disconnect: BEC C1035c.
- Measure the resistance between the inoperative parking lamp, harness side and the BEC, harness side as follows:





- Is the resistance less than 5 ohms?

Yes
INSTALL a new BEC. CLEAR the DTCs. REPEAT the self-test.

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

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N12 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. 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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