RAM 1500 Truck 4WD V8-5.7L VIN D (2005)
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(F21) Fused ignition switch output (run/start) circuit open
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(F1) Fused ignition switch output (off/run/start) circuit open
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(Z18) Instrument cluster ground circuit for an open
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Instrument cluster
DIAGNOSTIC TEST
1. NO RESPONSE - PCI BUS
NOTE: Diagnose and repair any MIC, PCM (ECM if diesel equipped), or Communication DTCs before proceeding with this test.
Turn the ignition on.
With the DRBIII(R), select System Monitors, then J1850 Module Scan.
Q: Does the DRBIII(R) display MIC PRESENT on the BUS?
YES: Go To 2
NO: Refer to the COMMUNICATION category and perform the appropriate symptom. Perform BODY VERIFICATION TEST - VER 1. See:
Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests/Body
Verification Test
2. NO RESPONSE - PCI BUS - POWERTRAIN CONTROL MODULE
Turn the ignition on.
With the DRBIII(R), select Body, MIC, SYSTEM TESTS, PCM Monitor.
Q: Does the DRBIII(R) display PCM INACTIVE on the BUS?
YES: Refer to the COMMUNICATION category and perform the appropriate symptom. Perform BODY VERIFICATION TEST - VER 1. See:
Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests/Body
Verification Test
NO: Go To 3
3. PCI BUS - INSTRUMENT CLUSTER
Turn the ignition on.
With the DRBIII(R), select Body, MIC, MODULE DISPLAY.
Q: Does the DRBIII(R) display NO RESPONSE from MIC?
YES: Refer to the COMMUNICATION category and perform the appropriate symptom. Perform BODY VERIFICATION TEST - VER 1. See:
Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests/Body
Verification Test
NO: Go To 4
4. CHECK THE (F21) FUSED IGNITION SWITCH OUTPUT (RUN/START) CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Inspect the #20 Fuse in the PDC.
