Pinpoint Test A: The Courtesy Lamps Do Not Illuminate With A Door Open

Interior Lighting

Pinpoint Test A: The Courtesy Lamps Do Not Illuminate With A Door Open

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

Normal Operation

The Body Control Module (BCM) sends a voltage signal to each door ajar switch (integrated into the door latch), which is routed to ground when the door is closed (the door ajar switch is closed when the door is closed). When the door is opened, the signal to ground is interrupted, indicating an open door to the BCM. When the BCM determines a door is open, the battery saver relay energizes (if not already energized) to supply voltage to the interior lamps and the BCM provides ground to the courtesy lamps.

The demand lamp system (map lamps) uses the interior lamps ground circuit.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Door latch
- BCM

PINPOINT TEST A: THE COURTESY LAMPS DO NOT ILLUMINATE WITH A 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 OPERATION OF THE COURTESY LAMPS FROM ALL THE DOORS

NOTE: Make sure the interior lamp switches are in the DOOR or COURTESY position before carrying out this step.

- Open all the doors and observe the interior lamps.
- Do the interior lamps illuminate?

Yes
CLOSE the doors. GO to A2.

No
CLOSE the doors. GO to Pinpoint Test B. Pinpoint Test B: One Or More Courtesy Lamps Are Inoperative

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A2 CHECK THE DOOR AJAR SWITCH OPERATION

- Ignition OFF.
- Disconnect: Suspect Door Latch .
- Do the courtesy lamps illuminate?

Yes
INSTALL a new door latch in question. REFER to Handles, Locks, Latches and Entry Systems Front Door Latch or Rear Door Latch. TEST the system for normal operation.

No
GO to A3.

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A3 CHECK THE DOOR AJAR SWITCH CIRCUIT FOR A SHORT TO GROUND

- Disconnect: BCM C2280G.
- Measure the resistance between the suspect door latch, 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 BCM OPERATION

- Disconnect all the BCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the BCM 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 BCM. REFER to Multifunction Electronic Modules Body Control Module (BCM). 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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