TEST ACTION APPLICABILITY
9 Disconnect the Horn connector.
Using a 12-volt test light connected to 12-volts, check the Ground circuit in the horn
connector.
Does the test light illuminate brightly?
All
Yes → Replace the Horns.
Perform BODY VERIFICATION TEST - VER 1.
No → Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
10 Gain access to the IPM C1 connector.
Using a 12-volt test light connected to ground, back probe the Horn Relay Output
circuit in the IPM C1 connector.
With the DRBIIIt, the actuate the horn relay.
Does the test light illuminate brightly?
All
Yes → Repair the Horn Relay Output circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No → Go To 11
11 Turn the ignition off.
Remove the Front Control Module from the Integrated Power Module.
NOTE: Check connectors - Clean/repair as necessary.
NOTE: The test light is still connected to the C1 connector.
Momentarily jumper the Horn Relay Control circuit to ground at the FCM connector.
Does the test light illuminate brightly?
All
Yes → Replace the Front Control Module in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No → Replace the Integrated Power Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
424
IGNITION, POWER, ACCESSORY
*HORNS INOPERATIVE — Continued
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