Dodge Ram Truck 1500-2500-3500. Manual — part 344
HORN
TABLE OF CONTENTS
page
page
HORN SYSTEM - ELECRICAL DIAGNOSTICS. . . . . 1
HORN SYSTEM - SERVICE INFORMATION . . . . . 19
HORN SYSTEM - ELECRICAL DIAGNOSTICS
TABLE OF CONTENTS
page
page
HORN SYSTEM - ELECRICAL DIAGNOSTICS
HORN RELAY CONTROL CIRCUIT HIGH
HORN RELAY CONTROL CIRCUIT LOW
HORN RELAY CONTROL CIRCUIT OPEN
. . . . . . . . . . . . . . . . . 11
HORN SYSTEM - ELECRICAL DIAGNOSTICS
DIAGNOSIS AND TESTING
DR/DH
HORN
8H - 1
HORN RELAY CONTROL CIRCUIT HIGH
8H - 2
HORN SYSTEM - ELECRICAL DIAGNOSTICS
DR/DH
HORN RELAY CONTROL CIRCUIT HIGH (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 excessive current on the Horn Relay Control circuit.
Possible Causes
INTERMITTENT DTC
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
, actuate the Horn Relay.
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 3
2.
INTEGRATED POWER MODULE
Turn the ignition off.
Remove the Front Control Module from the Integrated Power Module.
NOTE: NOTE: Check connectors - Clean/repair as necessary.
Use a fused jumper wire for the next step.
Momentarily jumper the Horn Relay Control circuit to ground at the
FCM connector.
Does the Horn sound?
Yes
>> Replace the Front Control 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)
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 TESTING)
DR/DH
HORN SYSTEM - ELECRICAL DIAGNOSTICS
8H - 3
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