Pinpoint Test An : The SCMG (Driver Multi-Contour Seat Module) Does Not Respond To The Diagnostic Scan Tool
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
- AN1 CHECK THE SCMG (DRIVER MULTI-CONTOUR SEAT MODULE) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: SCMG C3385 .
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C3385-1 Ground
Is the voltage greater than 11 volts?
Yes GO to AN3 No VERIFY the BJB fuse 79 (10A) is OK. If OK, GO to AN2 If not OK, Refer to the Wiring Diagram Information to identify the possible causes of the circuit short. - AN2 CHECK THE MULTI-CONTOUR SEAT RELAY CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: BJB C1035D .
Is the resistance less than 3 ohms?
Yes GO to AN6 No REPAIR the circuit. - AN3 CHECK THE SCMG (DRIVER MULTI-CONTOUR SEAT MODULE) GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure:
Positive Lead Measurement / Action Negative Lead C3385-16 Ground
Is the resistance less than 3 ohms?
Yes GO to AN4 No REPAIR the circuit. - AN4 CHECK THE MEDIUM SPEED CONTROLLER AREA NETWORK (MS-CAN) CIRCUITS BETWEEN THE SCMG (DRIVER MULTI-CONTOUR SEAT MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN
- Disconnect: GWM C2431 .
Are the resistances less than 3 ohms?
Yes GO to AN5 No REPAIR the circuit in question. - AN5 CHECK FOR CORRECT SCMG (DRIVER MULTI-CONTOUR SEAT MODULE) OPERATION
- Ignition OFF.
- Disconnect and inspect the SCMG connector.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the SCMG connector. Make sure it seats and latches correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, General Service Bulletin (GSB), SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new SCMG. REFER to: Driver Multi-Contour Seat Module [SCMG] . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues. - AN6 CHECK OPERATION OF INTERIOR LIGHTING
- Check operation of the interior lamps (dome lamp, courtesy lamps, luggage compartment lamp, etc).
Are the interior lamps operating normally?
Yes GO to AN7 No DIAGNOSE the demand LP/battery saver relay. REFER to: Interior Lighting . - AN7 CHECK THE MULTI-CONTOUR SEAT RELAY CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect BCM C2280G
- Disconnect BJB C1035C
Is the resistance less than 3 ohms?
Yes GO to AN8 No REPAIR the circuit. - AN8 CHECK FOR CORRECT BJB (BATTERY JUNCTION BOX) OPERATION
- Ignition OFF.
- Disconnect and inspect the BJB connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the BJB connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, General Service Bulletin (GSB), SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BJB. The multi-contour seat relay is not serviceable. No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.