Diagnostic System Check - Vehicle

DIAGNOSTIC SYSTEM CHECK

CIRCUIT DESCRIPTION
The ignition mode switch has 2 contact buttons.

The upper button, with a circle indicator on it, that starts the engine if the brake pedal is applied.

The lower button has two 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.
- Accessories This mode can be reached from the Off state 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.

TEST DESCRIPTION

Steps 1 - 6:

Steps 7 - 8:

The numbers below refer to the step numbers on the diagnostic table.
1. This step insures that the battery, and the vehicle primary power and ground systems are functioning correctly.
4. 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.