Dodge Ram Truck 1500-2500-3500. Manual

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

HORN RELAY CONTROL CIRCUIT DTC ACTIVE

Turn the ignition on.

With the DRBIII

, record and erase FCM DTC’s.

With the DRBIII

, actuate the Horn Relay.

With the DRBIII

, read FCM DTC’s.

Does the DRBIII

display a HORN RELAY CONTROL CIRCUIT DTC active?

Yes

>> Go To 2

>> Go To 3

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)

>> 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

Dodge Ram Truck 1500-2500-3500. Manual - part 344