Service manual

Body and Accessories Lighting Systems 8-95
2006 LSSV Service Manual Supplement
Diagnostic Information and
Procedures
Symptoms – Lighting Systems
Symptom List
Refer to a symptom diagnostic procedure from the
following list in order to diagnose the symptom:
• Blackout (B/O) Headlamp Inoperative
• Blackout (B/O) Headlamp Always On
• Headlamps Operate in Blackout (B/O) Mode
• Blackout (B/O) Stoplamps Inoperative
• Blackout (B/O) Marker Lamps Inoperative
• Voltmeter Gage Lamp Inoperative
• Blackout (B/O) Marker Lamps Always On
• DRL Operate in Blackout (B/O) Mode
• Backup Lamps Inoperative
• Backup Lamps Operate in Blackout (B/O) Mode
• Park Lamps Operate in Blackout (B/O) Mode
• CTSY Lamps Operate in Blackout (B/O) Mode
• Turn Signals Operate in Blackout (B/O) Mode
• High Beam Headlamps Operate in Blackout
(B/O) Mode
• Low Beam Headlamps Operate in Blackout
(B/O) Mode
Blackout (B/O) Headlamp Inoperative
Step Action Yes No
Schematic Reference: Exterior Lights Schematics and Interior Lights Schematics
1
Did you review Blackout (B/O) Lighting Description and
Operation?
Go to Step 2
Go to Blackout
(B/O) Lighting
Circuit Operation
2
Inspect condition of fuses. If fuse is open, locate and repair
source of overload and replace fuse.
Did you find and correct the condition?
Go to Step 20 Go to Step 3
3
1. Place blackout (B/O) service switch in blackout (B/O)
mode.
2. Turn ON blackout (B/O) headlamp switch.
3. Connect a test lamp to circuit 901 (TN/WH) at
connector C102M cavity A of the blackout (B/O)
headlamp and ground.
Does the test lamp illuminate?
Go to Step 4 Go to Step 7
4
1. Disconnect the blackout (B/O) lamp.
2. Connect a self-powered test lamp at circuit 151 (BK)
and ground.
Does the test lamp illuminate? Go to Step 6 Go to Step 5
5
Locate and repair open circuit 151 (BK) between blackout
(B/O) headlamp and G100M.
Did you complete the repair?
Go to Step 20
___
6
Replace blackout (B/O) headlamp bulb.
Did you complete the replacement? Go to Step 20
___
7
1. Place blackout (B/O) switch to ON position.
2. Connect a test lamp at circuit 901 (TN/WH) wire
between blackout (B/O) drive relay cavity 85 and
ground.
Does the test lamp illuminate?
Go to Step 8 Go to Step 9