PC13

- Key OFF.

- Insert 12V test light between bulb socket (+) and Pin 1.

- Key ON, observe test light and key OFF.

- Did the test light illuminate?

YES -- Service open in Circuit 603 (DG). Install bulb. Go to PC2. PC2

NO -- Service open in Circuit 57 (BK) between ECU Pin 20 and ground. Install bulb. Go to PC2. PC2