Service manual

Body and Accessories Lighting Systems 8-103
2006 LSSV Service Manual Supplement
Backup Lamps Inoperative (cont’d)
Step Action Yes No
4
1. Inspect the condition of the backup lamp fuses.
2. If the fuse is open, locate and repair the source of the
overload and replace fuse.
Go to Step 17 Go to Step 6
5
Test the ground circuit of the inoperative bulb for high
resistance or an open.
Did you find and correct the condition?
Go to Step 17 Go to Step 13
6
Connect a test lamp between connector C1 cavity C of the
junction block rear lamps and ground.
Does the test lamp illuminate? Go to Step 7 Go to Step 9
7
Connect a test lamp between connector C1 cavity E and
ground.
Does the test lamp illuminate? Go to Step 8 Go to Step 13
8
Locate and repair the open or high resistance in the ground
circuit.
Did you complete the repair? Go to Step 17
___
9
Connect a test lamp between cavity 30 of the interrupt relay
and ground.
Does the test lamp illuminate? Go to Step 10 Go to Step 11
10
Locate and repair the open in circuit 24.
Did you complete the repair? Go to Step 17
___
11
Connect a test lamp between cavity 87 of the interrupt relay
and ground.
Does the test lamp illuminate?
Go to Step 14 Go to Step 12
12
Connect a test lamp between cavity F of the backup lamp
switch and ground.
Does the test lamp illuminate?
Go to Step 15 Go to Step 16
13
Replace the bulbs.
Did you complete the replacement? Go to Step 17
___
14
Replace the interrupt relay.
Did you complete the replacement? Go to Step 17
___
15
Locate and repair the open or high resistance in circuit 1524 or
24.
Did you complete the repair? Go to Step 17
___
16
Replace the backup lamp switch.
Did you complete the replacement?
Go to Step 17
___
17
Operate the system in order to verify the repair.
Did you correct the condition? System OK Go to Step 2