Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Exterior Lights Schematics | ||||
1 | Did you review the Exterior Lighting Systems Description and Operation and perform the necessary inspections? | -- | Go to Step 2 | |
2 | Verify that the backup lamps are inoperative. Do the backup lamps operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Is only one backup lamp inoperative? | -- | Go to Step 4 | Go to Step 5 |
4 |
Did you complete the repair? | -- | Go to Step 20 | -- |
5 | Inspect the VEH B/U fuse in the underhood fuse block. Is the fuse open? | -- | Go to Step 6 | Go to Step 7 |
6 |
Did you complete the repair? | -- | Go to Step 20 | -- |
7 | Inspect the B/U LP fuse in the underhood fuse block. Is the fuse open? | -- | Go to Step 8 | Go to Step 9 |
8 | Disconnect the backup lamp switch (M/T) or the park/neutral position switch (A/T) and use the J 39200 digital multimeter (DMM) to test for continuity to ground in the Ignition 1 Voltage circuit. Refer to Circuit Testing in Wiring Systems. Is continuity present? | -- | Go to Step 13 | Go to Step 10 |
9 |
Is voltage present? | B+ | Go to Step 12 | Go to Step 14 |
10 | Disconnect the harness from the backup lamp switch (M/T) or the park/neutral position switch (A/T) and use the DMM to check the Ignition 1 Voltage circuit for voltage. Refer to Circuit Testing in Wiring Systems. Is voltage present? | B+ | Go to Step 11 | Go to Step 15 |
11 | Reinstall the backup lamp bulbs and connect a fused jumper between the ignition 1 voltage circuit and the backup lamp supply voltage circuit at the backup lamp switch (M/T) or the park/neutral position switch (A/T). Do the backup lamps illuminate? | -- | Go to Step 16 | Go to Step 19 |
12 | Use the DMM to test the ground circuit at either B/U lamp socket. Refer to Circuit Testing in Wiring Systems. Is continuity present? | -- | Go to Step 17 | Go to Step 18 |
13 | Repair the short to ground in the ignition 1 voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 20 | -- |
14 | Repair the short to ground in the backup lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 20 | -- |
15 | Repair the open or high resistance in the ignition 1 voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 20 | -- |
16 | Adjust or replace the backup lamp switch (M/T) or the park/neutral position switch (A/T). Refer to Park/Neutral Position Switch Adjustment or Park/Neutral Position Switch Replacement in Automatic Transmission - 4L60-E. Did you complete the repair? | -- | Go to Step 20 | -- |
17 | Repair the open or high resistance in the backup lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 20 | -- |
18 | Repair the open or high resistance in the ground circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 20 | -- |
19 | Repair the open or high resistance in the backup lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 20 | -- |
20 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
