The ignition mode switch has 2 contact buttons. The upper button, with a circle indicator on it, starts the engine if the brake pedal is applied. The lower button has 2 indicators on it, O and ACC. This button cycles the ignition through the following modes:
• | OFF--This is the normal state upon entering the vehicle, and can also be reached from any other mode by depressing the button. The O indicator illuminates. |
• | Accessory--This mode can be reached from the OFF or Accessory modes by depressing the button. The ACC indicator illuminates. |
• | ON with the engine OFF--This state can be reached from the OFF or Accessory modes by depressing the button for about 5-6 seconds. The upper LED illuminates. |
The numbers below refer to the step numbers on the diagnostic table.
This step ensures that the battery and the vehicle primary power and ground systems are functioning correctly.
Lack of communication may be due to a particular malfunction of a serial data circuit. The link to Data Link References will provide a list of modules and the associated data network no communication diagnostic link.
Step | Action | Yes | No | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Perform the following preliminary inspections:
Did you find and correct the condition? | System OK | Go to Step 2 | |||||||||||||||
2 | Install a scan tool. Does the scan tool power up? | Go to Step 3 | Go to Scan Tool Does Not Power Up in Computer/Integrating Systems | ||||||||||||||
3 | Turn ON the ignition, with the engine OFF. Is the NO FOB DETECTED message displayed on the driver information center (DIC)? | Go to Key Fob Not Detected in Keyless Entry | Go to Step 4 | ||||||||||||||
Does the scan tool communicate with all of the expected vehicle control modules? | Go to Step 5 | Go to Data Link References in Computer/Integrating Systems | |||||||||||||||
5 | Attempt to start the engine. Does the engine crank? | Go to Step 6 | Go to Symptoms - Engine Electrical in Engine Electrical | ||||||||||||||
6 | Attempt to start the engine. Does the engine start and idle? | Go to Step 7 | Go to Engine Cranks But Does Not Run in Engine Controls - 4.6L (LH2) | ||||||||||||||
7 |
Important: Do NOT clear any DTCs unless instructed by a diagnostic procedure.
Advance to the List All DTCs screen on the scan tool. Does the scan tool display any DTCs? | Go to Step 8 | |||||||||||||||
8 | Is the customer concern with inspection/maintenance (I/M) testing? | Go to Inspection/Maintenance (I/M) System Check in Engine Controls - 4.6L (LH2) | Go to Symptoms - Vehicle |