Pinpoint Test K : The PAM Does Not Respond To The Scan Tool
WARNING: This page is about a different car, the 2015 Lincoln MKS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Failure to disconnect the battery when instructed will result in false resistance readings. Refer to
Battery, Mounting and Cables
.
- K1 CHECK THE PAM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: PAM C4226A .
- Ignition ON.
- Measure the voltage
between:
Positive Lead Negative Lead Pin Circuit Pin Circuit C4226A-1 CBP34 (VT/BN) - Ground
Is the voltage greater than 11 volts?
Yes GO to K2. No VERIFY the Body Control Module (BCM) fuse 34 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short. - K2 CHECK THE PAM GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance
between:
Positive Lead Negative Lead Pin Circuit Pin Circuit C4226A-4 GD347 (BK/VT) - Ground
Is the resistance less than 3 ohms?
Yes GO to K3. No REPAIR the circuit in question. - K3 CHECK THE HS-CAN CIRCUITS BETWEEN THE PAM AND THE DLC FOR AN OPEN
- Measure the resistance
between:
Positive Lead Negative Lead Pin Circuit Pin Circuit C4226A-3 VDB04 (BU) C251-6 VDB04 (WH/BU) C4226A-11 VDB05 (WH) C251-14 VDB05 (WH)
Are the resistances less than 3 ohms?
Yes GO to K4. No REPAIR the circuit in question. - Measure the resistance
between:
- K4 CHECK FOR CORRECT PAM OPERATION
- Disconnect the PAM connector.
- Repair:
- corrosion (replace connector or terminals - clean module pins)
- damaged or bent pins - replace terminals/pins
- pushed-out pins - replace pins as necessary
- Connect the PAM connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no TSBs address this concern, INSTALL a new PAM. REFER to Parking Aid Audible . No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.