Left Rear Door Ajar CKT Open

Possible Causes:

• Ground CKT Open
• Left Rear Door Ajar Switch Sense CKT Open
• Left Rear Door Lock Motor/Ajar Switch Open
• Body Control Module

Testing

1. Turn ignition off. Disconnect left rear door lock motor/ajar switch connector. Using a 12-volt test light connected to battery voltage, probe left rear door lock motor/ajar switch connector terminal No. 2, ground circuit (Black wire). See Figure . If test light illuminates, leave left rear door lock motor/ajar switch connector disconnected and go to next step. If test light does not illuminate, repair open in Black wire.
2. Disconnect Body Control Module (BCM) connector C4. Measure resistance of left rear door ajar switch sense circuit (Tan/Red wire) between BCM connector C4 terminal No. 1 and left rear door lock motor/ajar switch connector terminal No. 1. See Figure . If resistance is less than 5 ohms, leave BCM connector C4 disconnected and go to next step. If resistance is 5 ohms or more, repair open in Tan/Red wire.
3. Ensure left rear door lock motor/ajar switch connector is properly connected. Using a 12-volt test light connected to battery voltage, probe BCM connector C4 terminal No. 1, left rear door ajar switch sense circuit (Tan/Red wire). Open left rear door. If test light illuminates with left rear door open, replace BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. If test light does not illuminate with left rear door open, replace left rear door lock motor/ajar switch. See POWER DOOR LOCKS & TRUNK RELEASE - CONCORDE, INTREPID & 300M article.