For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Exterior Lights Schematics Connector End View Reference: Master Electrical Component List
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Install the scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With the scan tool, command the Backup Lamp Relay Cmd. ON and OFF from the rear integration module (RIM) output controls data list.
4. Listen for the backup lamp relay to click as it is cycled from ON to OFF.

Does the backup lamp relay turn ON and OFF with each command?

Go to Step 3

Go to Step 4

3 |

1. Turn OFF the ignition.
2. Disconnect the reverse lamp relay. Refer to Relay Replacement .
3. Turn ON the ignition, with the engine OFF.

Do the backup lamps turn OFF?

Go to Step 4

Go to Step 8

4 |

1. Turn OFF the ignition.
2. Disconnect the reverse lamp relay. Refer to Relay Replacement .
3. Connect a test lamp between the backup lamp relay control side supply voltage circuit and the backup lamp relay control circuit.
4. Turn ON the ignition, with the engine OFF.
5. With a scan tool, command the Backup Lamp Relay ON and OFF.

Does the test lamp turn ON and OFF with each command?

Go to Step 6

Go to Step 5

5 | Test the reverse lamp relay control circuit for a short ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 7
6 | Inspect for poor connections at the reverse lamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 9
7 | Inspect for poor connections at the harness connector of the rear integration module (RIM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | Go to Step 11 | Go to Step 10
8 | Test the backup lamp supply voltage circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 11 | --
9 | Replace the reverse lamp relay. Refer to Relay Replacement . Did you complete the replacement? | Go to Step 11 | --
10 | Replace the RIM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 11 | --
11 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2