For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Backup Lights Diagnostic System Check? | -- | Go to Step 2 | Go to Backup Lamp System Check .
2 |

1. Disconnect the automatic transmission range switch connector.
2. Turn on the ignition.
3. Use a DMM in order to measure the voltage between terminal D of the automatic transmission range switch connector and a known good ground.

Does the voltage measure near the specified value?

B+

Go to Step 3

Go to Step 4

3 |

1. Locate an open or a high resistance in CKT X756 and/or CKT X757.
2. Repair the open or the high resistance in CKT X756 and/or CKT 757.

Did you complete the repair?

--

Go to Step 11

--

4 | Connect a fused jumper wire between terminal D and terminal F of the automatic transmission range switch connector. Do the backup lamps illuminate? | -- | Go to Step 5 | Go to Step 6
5 | Replace the automatic transmission range switch. Refer to Manual Shift Shaft Position Switch Replacement in Automatic Transmission. Did you complete the repair? | -- | Go to Step 11 | --
6 |

1. Disconnect the LH and RH backup lamp connector.
2. Use the DMM in order to measure the voltage between terminal 2 of the LH and RH backup lamp connector and a known good ground.

Does the voltage measure near the specified value?

B+

Go to Step 8

Go to Step 7

7 |

1. Locate an open or a high resistance in circuits MF1, MF10 and/or MF757.
2. Repair the open or the high resistance in circuits MF1, MF10 and/or MF757.

Did you complete the repair?

--

Go to Step 11

--

8 | Use the DMM in order to measure the resistance between terminal 1 of the LH and RH backup lamp connector and a known good ground. Does the resistance measure near the specified value? | Less than 5 ohms | Go to Step 10 | Go to Step 9
9 |

1. Locate an open or a high resistance in CKT F1 and/or CKT F2.
2. Repair the open or the high resistance in CKT F1 and/or CKT F2.

Did you complete the repair?

--

Go to Step 11

--

10 | Replace the LH and/or RH backup lamp. Refer Backup Lamp Bulb Replacement in Lighting Systems. Did you complete the repair? | -- | Go to Step 11 | --
11 |

1. Connect all connectors and components that were previously disconnected.
2. Verify that the backup lamps operate properly.

Do the backup lamps operate properly?

--

Go to Backup Lamp System Check .

Go to Step 1