Dodge Ram Truck 1500-2500-3500. Manual — part 345
HORN RELAY CONTROL CIRCUIT HIGH (CONTINUED)
3.
WIRING HARNESS INSPECTION
Turn the ignition off.
Visually inspect the related circuit connectors. Look for broken, bent, pushed out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes
>> Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)
No
>> Test Complete.
8H - 4
HORN SYSTEM - ELECRICAL DIAGNOSTICS
DR/DH
HORN RELAY CONTROL CIRCUIT LOW
DR/DH
HORN SYSTEM - ELECRICAL DIAGNOSTICS
8H - 5
HORN RELAY CONTROL CIRCUIT LOW (CONTINUED)
For the Horn System circuit diagram (Refer to 8 - ELECTRICAL/HORN - SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition ON.
•
Set Condition:
When the Front Control Module detects a short on the Horn Relay Control circuit.
Possible Causes
INTERMITTENT DTC
FUSE #45
INTEGRATED POWER MODULE
FRONT CONTROL MODULE
Diagnostic Test
1.
HORN RELAY CONTROL CIRCUIT DTC ACTIVE
Turn the ignition on.
With the DRBIII
T
, record and erase FCM DTC’s.
With the DRBIII
T
, read FCM DTC’s.
Does the DRBIII
T
display a HORN RELAY CONTROL CIRCUIT DTC active?
Yes
>> Go To 2
No
>> Go To 4
2.
CHECK FUSE #45
Turn the ignition off.
Check fuse #45 in the IPM.
Is the fuse open?
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)
No
>> Go To 3
8H - 6
HORN SYSTEM - ELECRICAL DIAGNOSTICS
DR/DH
HORN RELAY CONTROL CIRCUIT LOW (CONTINUED)
3.
INTEGRATED POWER MODULE
Reinstall the fuse if previously removed.
Remove the Front Control Module from the Integrated Power Module.
NOTE: Check connectors - Clean/repair as necessary.
Turn the ignition on.
Measure the voltage of the Horn Relay Control circuit.
Is the voltage above 11.0 volts?
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. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING)
4.
WIRING HARNESS INSPECTION
Turn the ignition off.
Visually inspect the related circuit connectors. Look for broken, bent, pushed out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes
>> Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)
No
>> Test Complete.
DR/DH
HORN SYSTEM - ELECRICAL DIAGNOSTICS
8H - 7
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