RAM 1500 Truck 4WD V8-5.7L VIN D (2005)
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A/C Heater control
Diagnostic Test
1. CHECK FOR DTCs IN THE CLUSTER (MIC)
Turn the ignition on.
With the DRBIII(R), read Cluster DTCs.
Q: Does the DRBIII(R) display any DTCs?
YES: Diagnose and repair the DTC(s). 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 2
2. TEST (E16) PANEL LAMPS DRIVER CIRCUIT USING A TEST LIGHT
Turn the Headlamp switch on.
Rotate the Cargo Dome switch to the full brightness setting.
CAUTION: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
Using a 12-volt test light connected to ground, back probe the (E16) Panel Lamps Driver circuit in the A/C Heater Control C1 harness connector.
Q: Does the test light illuminate brightly?
YES: (Dual-Zone Systems)
Replace the A/C Heater Control. 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
YES: (Single-Zone Systems)
Go To 3
NO: Go To 4
3. INSPECT THE INOPERATIVE BULB(S)
Turn the ignition off.
Remove the inoperative bulb(s) from the A/C Heater Control.
NOTE: If necessary, hold the bulb in front of a lamp to see the filament.
Inspect the bulb(s).
Q: Is each inoperative bulb Ok?
YES: Replace the A/C Heater Control. 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: Replace the inoperative bulb(s). Perform BODY VERIFICATION TEST - VER 1. See: Powertrain Management/Computers and Control
