Chrysler Town, Dodge Caravan. Manual — part 841
Symptom:
HORN RELAY OPEN
When Monitored and Set Condition:
HORN RELAY OPEN
When Monitored:
Continuously with the ignition on.
Set Condition:
The FCM has detected an open in the Horn Relay Control circuit.
POSSIBLE CAUSES
FUSE AND RELAY CENTER INTERNAL MALFUNCTION
HORN RELAY
INTERMITTENT CONDITION
FRONT CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, erase the current Front Control Module DTC’s.
Turn the ignition off, wait 10 seconds then turn the ignition on.
With the DRBIII
t, read the current Front Control Module DTC’s.
Does the DRBIII
t display: HORN RELAY OPEN?
All
Yes
→ Go To 2
No
→ The condition that caused this symptom is currently not present.
Inspect the related wiring harness for a possible intermittent
condition.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Remove the Horn Relay from the Fuse and Relay Center.
Substitute the original Horn Relay with a known good relay.
Turn the ignition on.
With the DRBIII
t, erase the current Front Control Module DTCs.
Turn the engine off, wait 10 seconds then turn the ignition on.
Attempt to operate the horn.
With the DRBIII
t, read the current Front Control Module DTC’s.
Does the DRBIII
t display: HORN RELAY OPEN?
All
Yes
→ Go To 3
No
→ Replace the Horn Relay.
Perform BODY VERIFICATION TEST - VER 1.
600
IGNITION, POWER, ACCESSORY
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Remove the Horn Relay from the Fuse and Relay Center.
Disconnect the Front Control Module from the Fuse and Relay Center.
Measure the resistance of the Horn Relay Control circuit between the FCM connector
cavity 10 and the Horn Relay connector cavity 85.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Fuse and Relay Center.
Perform BODY VERIFICATION TEST - VER 1.
601
IGNITION, POWER, ACCESSORY
HORN RELAY OPEN —
Continued
Symptom:
HORN RELAY SHORTED TO B+
When Monitored and Set Condition:
HORN RELAY SHORTED TO BATTERY
When Monitored:
Continuously with the ignition on.
Set Condition:
The FCM has detected a short to battery in the Horn Relay Control circuit.
POSSIBLE CAUSES
FUSE AND RELAY CENTER INTERNAL MALFUNCTION
HORN RELAY
INTERMITTENT CONDITION
FRONT CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, erase the current Front Control Module DTC’s.
Turn the ignition off, wait 10 seconds then turn the ignition on.
With the DRBIII
t, read the current Front Control Module DTC’s.
Does the DRBIII
t display: HORN RELAY SHORTED TO BATTERY?
All
Yes
→ Go To 2
No
→ The condition that caused this symptom is currently not present.
Inspect the related wiring harness for a possible intermittent
condition.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Remove the Horn Relay from the Fuse and Relay Center.
Substitute the original Horn Relay with a known good relay.
Turn the ignition on.
With the DRBIII
t, erase the current Front Control Module DTCs.
Turn the ignition off, wait 10 seconds, then turn the ignition on.
Attempt to operate the horn.
With the DRBIII
t, read the current Front Control Module DTC’s.
Does the DRBIII
t display: HORN RELAY SHORTED TO BATTERY?
All
Yes
→ Go To 3
No
→ Replace the Horn Relay.
Perform BODY VERIFICATION TEST - VER 1.
602
IGNITION, POWER, ACCESSORY
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Front Control Module from the Fuse and Relay Center.
Disconnect the Horn Relay from the Fuse and Relay Center.
Measure the voltage of the Horn Relay Control circuit at the Fuse and Relay Center
side of the FCM connector.
Is the voltage above 10.0 volts?
All
Yes
→ Replace the Fuse and Relay Center.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
603
IGNITION, POWER, ACCESSORY
HORN RELAY SHORTED TO B+ —
Continued
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