Pinpoint Test I: The Puddle Lamp(s) Are Inoperative

Interior Lighting

Pinpoint Tests

Pinpoint Test I: The Puddle Lamp(s) Are Inoperative

Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. Diagrams By Number

Normal Operation

The Smart Junction Box (SJB) provides voltage to the puddle lamps through circuit CLN26 (BU) when the courtesy lamps are active. The puddle lamps have separate ground circuits. The LH exterior mirror is grounded through circuit GD126 (BK/WH), and the RH exterior mirror is grounded through circuit GD139 (BK/YE).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Exterior mirror



PINPOINT TEST I: THE PUDDLE LAMP(S) ARE 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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I1 CHECK THE COURTESY LAMP OPERATION


- Ignition OFF.
- Operate the courtesy lamps using the instrument panel dimmer switch.
- Do the courtesy lamps illuminate?

Yes
GO to I2.

No
Go To Pinpoint Test A. Pinpoint Test A: The Courtesy Lamps Are Inoperative

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I2 CHECK CIRCUIT CLN26 (BU) FOR VOLTAGE


- Disconnect: Suspect Exterior Mirror.
- Operate the courtesy lamps using the instrument panel dimmer switch.
- Measure the voltage between the suspect exterior mirror, harness side and ground as follows:





- Is the voltage greater than 10 volts?

Yes
GO to I3.

No
REPAIR the circuit in question. TEST the system for normal operation.

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I3 CHECK THE GROUND CIRCUIT FOR AN OPEN


- Disconnect: Negative Battery Cable.
- Measure the resistance between the suspect exterior mirror, harness side and ground as follows:





- Is the resistance less than 5 ohms?

Yes
INSTALL a new exterior mirror for the suspect exterior mirror. REFER to Mirrors. TEST the system for normal operation.

No
REPAIR the circuit in question. TEST the system for normal operation.

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