Pinpoint Test A: The Courtesy Lamp Does Not Turn On With One Door Open

Interior Lighting

Pinpoint Tests


Pinpoint Test A: The Courtesy Lamp Does Not Turn On With One Door Open

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

Refer to Wiring Diagram Set 117, Remote Keyless Entry And Alarm for schematic and connector information. Diagrams By Number

Normal Operation

The Smart Junction Box (SJB) sends a voltage signal to the door ajar switches. When the door is closed, the voltage signal is routed to ground. When the door is opened, the signal to ground is interrupted indicating an open door to the SJB.

When any door is opened, or an unlock request from a programmed Remote Keyless Entry (RKE) transmitter is detected, the SJB provides voltage to the courtesy lamp.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Door ajar switch
- SJB



PINPOINT TEST A: THE COURTESY LAMP DOES NOT TURN ON WITH ONE DOOR OPEN

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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A1 CHECK THE COURTESY LAMP OPERATION USING THE INSTRUMENT PANEL DIMMER SWITCH


- Operate the courtesy lamp using the instrument panel dimmer switch.
- Does the courtesy lamp illuminate using the instrument panel dimmer switch?

Yes
GO to A2.

No
GO to Pinpoint Test C. Pinpoint Test C: The Interior Courtesy Lamp Is Inoperative

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A2 CHECK THE DOOR AJAR SWITCH OPERATION


- Ignition OFF.
- Disconnect: Suspect Door Ajar Switch.
- Do the interior lamps illuminate?

Yes
INSTALL a new door latch in question. REFER to Doors, Hood and Trunk &/or Locks. TEST the system for normal operation.

No
GO to A3.

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A3 CHECK THE AJAR SWITCH CIRCUIT FOR A SHORT TO GROUND


- Disconnect: SJB C2280c.
- Measure the resistance between the suspect door ajar switch, harness side and ground as follows:









- Is the resistance greater than 10,000 ohms?

Yes
GO to A4.

No
REPAIR the circuit in question for a short to ground. TEST the system for normal operation.

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A4 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.

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