The rear integration module (RIM) controls battery positive voltage and ground to the interior courtesy lamps in the following manner. Battery voltage is supplied through the INTERIOR LAMP fuse to both the switch side and coil side of the interior lamp relay. The RIM provides a ground to the control circuit of the interior lamp relay during all power modes except when battery run down protection is active. With the interior lamp relay energized, battery positive voltage is supplied to all the interior lamps in this group. The ground side circuits of the door, footwell, and overhead courtesy lamps are controlled by a pulse width modulated (PWM) ground circuit of the RIM. The RIM pulses the on time of the ground circuit between 0-100 percent at a frequency of approximately 100 hertz. By decreasing the on time percentage of the controlled ground circuit the intensity of the lamps will decrease. This effect is called theater dimming.

Schematic Reference

Connector End View Reference

Component Connector End Views

Description and Operation

Interior Lighting Systems Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the scan tool Courtesy Lamp Switch parameter while turning the courtesy lamp switch ON and OFF. The reading should toggle between Off and On.

⇒	If the reading does not change between the commanded states, refer to Courtesy Lamp Switch Malfunction.

2. Observe the scan tool Driver Door Open Switch parameter while opening and closing the driver door. The reading should toggle between Open and Closed.

⇒	If the reading does not change between the commanded states, refer to Door Open Switch Malfunction.

3. Observe the scan tool Passenger Door Open Switch parameter while opening and closing the passenger door. The reading should toggle between Open and Closed.

⇒	If the reading does not change between the commanded states, refer to Door Open Switch Malfunction.

4. Observe the scan tool Left Rear Passenger Door Open switch parameter while opening and closing the passenger door. The reading should toggle between Open and Closed.

⇒	If the reading does not change between the commanded states, refer to Door Open Switch Malfunction.

5. Observe the scan tool Right Rear Passenger Door Open switch parameter while opening and closing the passenger door. The reading should toggle between Open and Closed.

⇒	If the reading does not change between the commanded states, refer to Door Open Switch Malfunction.

Courtesy Lamps Malfunction -- All

1. Ignition OFF, disconnect the INT LAMP relay.
2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal R19 and ground.

⇒	If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the RIM.

3. Verify that a test lamp illuminates between the B+ circuit terminal R17 and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal R19 for a short to ground. If the circuit tests normal, test or replace the INT LAMP relay.

4. Verify that a test lamp illuminates between the B+ circuit terminal R18 and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.

5. Disconnect the harness connector at the inoperative courtesy lamp.
6. Ignition OFF, scan tool OFF, exterior lamps OFF, interior lamps OFF, test for less than 5 ohms between the control circuit terminal B and ground.

⇒	If greater than the specified range, test the control circuit for an open/high resistance. If the circuit test normal, replace the RIM.

7. Connect the harness connector at the inoperative courtesy lamp.
8. Connect a 10A fused jumper wire between the B+ circuit terminal R17 and the control circuit terminal R19. Verify the courtesy lamps are ON.

⇒	If the courtesy lamps do not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the inoperative courtesy lamp.

9. Connect a test lamp between the B+ circuit terminal R18 and the control circuit terminal R20.
10. Command the Courtesy Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the RIM.

⇒	If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the RIM.

11. If all circuits test normal, test or replace the INT LAMP relay.

Door Courtesy Lamp Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate door courtesy lamp.
2. Ignition OFF, scan tool OFF, interior lamps OFF, doors CLOSED, test for less than 1 ohm between the control circuit terminal B and ground.

⇒	If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the appropriate door control module.

3. Connect a test lamp between the control circuit terminal A and the control circuit terminal B.
4. Command the Exterior Courtesy Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always ON, test the control circuit terminal A for a short to voltage. If the circuit tests normal, replace the appropriate door control module.

⇒	If the test lamp is always OFF, test the control circuit terminal A for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate door control module.

5. If all circuits test normal, test or replace the appropriate door courtesy lamp.

Courtesy Lamp Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the I/P dimmer switch.
2. Ignition OFF, verify that a test lamp illuminates between B+ and the low reference circuit terminal 1.

⇒	If the test lamp does not illuminate, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the IPM.

3. Ignition ON, verify the scan tool Courtesy Lamp Switch parameter is Off.

⇒	If not the specified value, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the IPM.

4. Install a 3A fused jumper wire between the signal circuit terminal 3 and ground. Verify the scan tool Courtesy Lamp Switch parameter is On.

⇒	If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPM.

5. If all circuits test normal, test or replace the I/P dimmer switch.

Door Open Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the inoperative door latch assembly.
2. Ignition OFF, interior lamps OFF, doors CLOSED, test for less than 5 ohms between the ground circuit and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool Door Open Switch parameter is Closed.

⇒	If the not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the appropriate door control module.

4. Install a 3A fused jumper wire between the signal circuit and ground. Verify the scan tool Door Open Switch parameter is Open.

⇒	If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the appropriate door control module.

5. If all circuits test normal, test or replace the inoperative door latch assembly.

Rear Compartment Courtesy Lamp Malfunction

1. Ignition OFF, disconnect the harness connector at the rear compartment courtesy lamp.
2. Ignition OFF, doors CLOSED, interior lamps OFF, test for less than 5 ohms between the control circuit terminal C and ground.

⇒	If greater than the specified range, test the control circuit for an open/high resistance.

3. Ignition OFF, connect a test lamp between the signal circuit terminal B and ground.
4. Command the Trunk Release Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the rear compartment lid release actuator.

⇒	If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the rear compartment lid release actuator.

5. If all circuits test normal, replace the rear compartment courtesy lamp.

Overhead Console Courtesy Lamp Malfunction - Front or Rear

1. Ignition OFF, disconnect the harness connector at the inoperative overhead console lamp assembly.
2. Ignition OFF, scan tool OFF, doors CLOSED, interior lamps OFF, test for less than 1 ohm between the control circuit terminal B and ground.

⇒	If greater than the specified range, test the control circuit for an open/high resistance. If the circuit test normal, replace the RIM.

3. Ignition OFF, connect a test lamp between the control circuit terminal A and the control circuit terminal B.
4. Command the Courtesy Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the RIM.

⇒	If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the RIM.

5. If all circuits test normal, replace the inoperative overhead console lamp assembly.

I/P Compartment Lamp Malfunction

1. Ignition OFF, disconnect the harness connector at the I/P Compartment lamp switch.
2. Ignition OFF, scan tool OFF, doors CLOSED, interior lamps OFF, test for less than 1 ohm between the ground circuit terminal A and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition OFF, connect a test lamp between the control circuit terminal B and the ground circuit terminal A.
4. Command the Courtesy Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance.

⇒	If the test lamp is always ON, test the control circuit for a short to voltage.

5. If all circuits test normal, replace the I/P compartment lamp switch.

Reading Lamps Malfunction

1. Ignition OFF, disconnect the harness connector at the inoperative vanity mirror.
2. Ignition OFF, scan tool OFF, interior lamps OFF, test for less than 1 ohm between the ground circuit terminal C and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the control circuit terminal A and ground.

⇒	If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance.

4. If all circuits test normal, replace the inoperative reading lamp.

Vanity Mirror Lamps Malfunction

1. Ignition OFF, disconnect the harness connector at the inoperative vanity mirror.
2. Ignition OFF, scan tool OFF, interior lamps OFF, test for less than 1.0 ohm between the ground circuit terminal A and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, interior lamps ON, verify that a test lamp illuminates between the control circuit terminal B and ground.

⇒	If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance.

4. If all circuits test normal, replace the inoperative vanity mirror.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.