Symptom List:
HORN RELAY CONTROL CIRCUIT LOW
HORN RELAY CONTROL CIRCUIT OPEN
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be HORN RELAY CONTROL CIR-
CUIT LOW.
When Monitored and Set Condition:
HORN RELAY CONTROL CIRCUIT LOW
When Monitored: With the ignition ON.
Set Condition: When the Front Control Module detects a short on the Horn Relay Control
circuit.
HORN RELAY CONTROL CIRCUIT OPEN
When Monitored: With the ignition ON.
Set Condition: When the Front Control Module detects an open on the Horn Relay
Control circuit.
POSSIBLE CAUSES
FRONT CONTROL MODULE
FUSE #45
INTEGRATED POWER MODULE
INTERMITTENT DTC
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, record and erase FCM DTC’s.
With the DRBIIIt, read FCM DTC’s.
Does the DRBIIIt display a HORN RELAY CONTROL CIRCUIT DTC active?
All
Yes → Go To 2
No → Go To 4
2 Turn the ignition off.
Check fuse #45 in the IPM.
Is the fuse open?
All
Yes → Replace the fuse. Check for a short to ground in the Horn Relay
Output circuit from the IPM to the horns.
Perform BODY VERIFICATION TEST - VER 1.
No → Go To 3
419
IGNITION, POWER, ACCESSORY
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