RAM 1500 Truck 4WD V8-5.7L VIN D (2005)
Turn the ignition off.
Disconnect the Instrument Cluster C3 harness connector.
Turn the ignition on.
Measure the voltage between the (F21) Fused Ignition Switch Output (Run/Start) circuit and ground.
Q: Is the voltage below 10.5 volts?
YES: Repair the (F21) Fused Ignition Switch Output (Run/Start) circuit for an open. Perform BODY VERIFICATION TEST - VER 1. See:
Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated
Procedures/Verification Tests/Body Verification Test
NO: Go To 7
7. CHECK THE (F1) FUSED IGNITION SWITCH OUTPUT (OFF/RUN/START) CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the Instrument Cluster C3 harness connector.
Turn the ignition on.
Measure the voltage between the (F1) Fused Ignition Switch Output (Off/Run/Start) circuit and ground.
Q: Is the voltage below 10.5 volts?
YES: Repair the (F1) Fused Ignition Switch Output (Off/Run/ Start) circuit for an open. Perform BODY VERIFICATION TEST - VER 1. See:
Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated
Procedures/Verification Tests/Body Verification Test
NO: Go To 8
8. CHECK THE (Z18) INSTRUMENT CLUSTER GROUND CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the Instrument Cluster C3 harness connector.
