RAM 1500 Truck 4WD V8-5.7L VIN D (2005)
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Horn relay output circuit open
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Horn switch
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Horn switch ground
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Clockspring
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Horn switch sense open
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Integrated power module
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Instrument cluster
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Front control module
Diagnostic Test
1. HORN RELAY CONTROL CIRCUIT DTC ACTIVE
Turn the ignition on.
With the DRBIII(R), read FCM DTC's.
Q: Does the DRBIII(R) display a HORN RELAY CONTROL CIRCUIT DTC active?
YES: Refer to symptom list. Perform BODY VERIFICATION TEST - VER 1. See: Testing and Inspection/Diagnostic Trouble Code Tests and
Associated Procedures/Verification Tests/Body Verification Test
NO: Go To 2
2. ACTUATE HORN RELAY
With the DRBIII(R), actuate the Horn Relay.
Q: Do the horns operate?
YES: Go To 3
NO: Go To 7
3. HORN SWITCH
WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
CAUTION: Do not place an intact undeployed airbag face down on a hard surface, the airbag will propel into the air if accidentally deployed,
and could result in serious or fatal injury.
Gain access to the horn switch.
Measure the resistance of the Horn Switch ground circuit.
Q: Is the resistance below 5.0 ohms?
YES: Go To 4
NO: Repair the horn switch ground as necessary. Perform BODY VERIFICATION TEST - VER 1. See: Testing and Inspection/Diagnostic
Trouble Code Tests and Associated Procedures/Verification Tests/Body Verification Test
4. HORN SWITCH
WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
CAUTION: Do not place an intact undeployed airbag face down on a hard surface, the airbag will propel into the air if accidentally deployed,
and could result in serious or fatal injury.
Gain access to the horn switch connector.
WARNING: TURN THE IGNITION ON, THEN RECONNECT THE BATTERY.
Momentarily connect a jumper wire between the Horn Switch Sense circuit at the Horn switch connector and ground.
Q: Did the horns sound?
YES: Replace the horn switch. Perform BODY VERIFICATION TEST - VER 1. See: Testing and Inspection/Diagnostic Trouble Code Tests
and Associated Procedures/Verification Tests/Body Verification Test
NO: Go To 5
5. CLOCKSPRING
