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 110, Power Door Locks for schematic and connector information. Diagrams By Number

Normal Operation

The Smart Junction Box (SJB) (vehicles without Intelligent Access (IA)) or the Remote Function Actuator (RFA) module (vehicles with IA (Intelligent Access)) send a voltage signal to each door ajar switch, 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 SJB (Smart Junction Box) or the RFA (Remote Function Actuator) module.

For vehicles with IA (Intelligent Access), the RFA (Remote Function Actuator) module then sends a door ajar message to the SJB (Smart Junction Box) over the communication network.

When the SJB (Smart Junction Box) detects an open door, the SJB (Smart Junction Box) provides voltage to the courtesy lamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Door ajar switch

- SJB (Smart Junction Box)

- RFA (Remote Function Actuator) module

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.

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

- Ignition OFF.

- Press and hold the instrument panel dimmer switch to the DOME LAMP ON (second detent up) position for 3 seconds.

Do the interior courtesy lamps illuminate using the instrument panel dimmer switch?

Yes
GO to A2.

No
GO to Pinpoint Test C. Pinpoint Test C: One Or More Interior Courtesy Lamp Is Inoperative

A2 CHECK THE DOOR AJAR SWITCH OPERATION

- Press and hold the instrument panel dimmer switch to the DOME LAMP OFF (second detent down) position for 3 seconds.

- Disconnect: Suspect Door Latch.

Do the interior lamps illuminate?

Yes
INSTALL a new door latch in question. TEST the system for normal operation.

No
GO to A3.

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

- Disconnect: SJB (Smart Junction Box) C2280C (Vehicles Without IA (Intelligent Access)).

- Disconnect: RFA (Remote Function Actuator) Module C2153E (Vehicles With IA (Intelligent Access)).

- Measure the resistance between the suspect door latch, harness side and ground as follows:









Is the resistance greater than 10,000 ohms?

Yes
For vehicles without IA (Intelligent Access), GO to A4.

For vehicles with IA (Intelligent Access), GO to A5.

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

A4 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION

- Disconnect all the SJB (Smart Junction Box) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the SJB (Smart Junction Box) 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 (Smart Junction Box). 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.

A5 CHECK FOR CORRECT RFA (Remote Function Actuator) MODULE OPERATION

- Disconnect all the RFA (Remote Function Actuator) module connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the RFA (Remote Function Actuator) module 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 RFA (Remote Function Actuator) module. 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.