Service manual

Body and Accessories Horns 8-49
2006 LSSV Service Manual Supplement
Diagnostic Information and
Procedures
Symptoms – Horns
Refer to a symptom diagnostic procedure from the
following list in order to diagnose the symptom:
• Horns Inoperative in Blackout (B/O) Mode
• Horns Operate In Blackout (B/O) Mode
Horns Inoperative in Blackout (B/O) Mode
Step Action Yes No
Schematic Reference: Horn Schematics
1
Did you review Horns Description and Operation?
Go to Step 2
Go to Horn with
Blackout (B/O)
Control Circuit
Operation
2
Depress the horn switch.
Does either horn operate?
Go to Horns
Inoperative – One
Horn 2006 C/K
Truck Service
Manual
Go to Step 3
3
1. Remove the horn interrupt relay.
2. Connect a jumper between terminal 30 and 87 of the
relay block.
Does either horn operate?
Go to Step 4
Go to Horns
Inoperative in
2006 C/K Truck
Service Manual
4
Connect a test lamp between terminal 86 of the relay block and
ground.
Does the test lamp illuminate?
Go to Step 6 Go to Step 5
5
Connect a test lamp between terminal C of the blackout (B/O)
service switch and ground.
Does the test lamp illuminate?
Go to Step 7 Go to Step 8
6
Connect a test lamp between terminal 85 of the relay block and
ground.
Does the test lamp illuminate?
Go to Step 9 Go to Step 10
7
Repair the open or high resistance in the (OG) circuit 912.
Did you complete the repair? Go to Step 13
___
8
Connect a test lamp between terminal B of the blackout (B/O)
service switch and ground.
Does the test lamp illuminate? Go to Step 11 Go to Step 12
9
Repair the open or high resistance in the (BK) circuit 150.
Did you complete the repair?
Go to Step 13
___
10
Replace the horn interrupt relay.
Did you complete the repair?
Go to Step 13
___