Important: The following steps must be completed before using the symptom diagnostic tables.
• | There are not any DTCs set. |
• | The control modules can communicate via the serial data link. |
• | Inspect for aftermarket devices which can affect the operation of the instrument panel cluster or the audible warnings system. Refer to Checking Aftermarket Accessories in Wiring Systems. |
• | Inspect the accessible system components or the visible system components for obvious damage or for obvious conditions which can cause the symptom. |
• | Inspect for the proper fluid levels. |
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
• | ABS Indicator Always On in Antilock Brake System |
• | ABS Indicator Inoperative in Antilock Brake System |
• | Air ABS Indicator Always On in Air Antilock Brake System |
• | Air ABS Indicator Inoperative in Air Antilock Brake System |
• | Air Low Traction Indicator Always On in Air Antilock Brake System |
• | Air Low Traction Indicator Inoperative in Air Antilock Brake System |
• | Air Traction Off Indicator Always On in Air Antilock Brake System |
• | Air Traction Off Indicator Inoperative in Air Antilock Brake System |
• | Brake Warning Indicator Always On in Hydraulic Brakes |
• | Brake Warning Indicator Inoperative in Hydraulic Brakes |
• | Charge Indicator Always On in Engine Electrical |
• | Charge Indicator Inoperative in Engine Electrical |
• | CHECK TRANS Indicator Malfunction in Automatic Transmission |
• | Daytime Running Lamps (DRL) Indicator Inoperative in Lighting Systems |
• | Differential Lock Indicator Inoperative in Rear Drive Axle - Locking / Limited Slip Rear Axle |
• | EXHAUST BRAKE Indicator Malfunction in Engine Exhaust |
• | High Beam Indicator Inoperative in Lighting Systems |
• | Low Air Indicator Always On in Air Brakes |
• | Low Air Indicator Inoperative in Air Brakes |
• | Low Engine Coolant Indicator Always On in Engine Cooling |
• | Low Traction Indicator Always On in Antilock Brake System |
• | Low Traction Indicator Inoperative in Antilock Brake System |
• | Low Washer Fluid Indicator Malfunction in Wipers/Washer Systems |
• | Malfunction Indicator Lamp (MIL) Always On in Engine Controls - 6.6 L |
• | Malfunction Indicator Lamp (MIL) Inoperative in Engine Controls - 6.6 L |
• | Malfunction Indicator Lamp (MIL) Always On in Engine Controls - 7.8 L |
• | Malfunction Indicator Lamp (MIL) Inoperative in Engine Controls - 7.8 L |
• | Service Brake Soon Indicator Always On in Hydraulic Brakes |
• | Service Brake Soon Indicator Inoperative in Hydraulic Brakes |
• | Traction Off Indicator Always On in Antilock Brake System |
• | Traction Off Indicator Inoperative in Antilock Brake System |
• | Trailer ABS Indicator Always On in Air Antilock Brake System |
• | Trailer ABS Indicator Inoperative in Air Antilock Brake System |
• | Turn Signal Lamps and/or Indicators Inoperative in Lighting Systems |