Pinpoint Test AU : The Gateway Module (GWM) 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.
- AU1 CHECK THE HS-CAN1 (HIGH-SPEED CONTROLLER AREA NETWORK 1) TERMINATION RESISTANCE
- Ignition OFF.
- Disconnect negative battery cable.
- Disconnect the diagnostic scan tool cable from the DLC.
Is the resistance between 54 and 66 ohms?
Yes GO to AU3 No GO to AU2 - AU2 CHECK THE HS-CAN1 (HIGH-SPEED CONTROLLER AREA NETWORK 1) CIRCUITS BETWEEN THE GWM (GATEWAY MODULE A) AND THE DLC (DATA LINK CONNECTOR) FOR AN OPEN
- Disconnect GWM C2431 .
- Measure:
Positive Lead Measurement / Action Negative Lead C2431-20 (component side) C251-6 C2431-19 (component side) C251-14
Are the resistances less than 3 ohms?
Yes GO to AU3 No GO to AU11 - AU3 CHECK THE HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) TERMINATION RESISTANCE
- Connect: GWM C2431 .
Is the resistance between 54 and 66 ohms?
Yes GO to AU5 No GO to AU4 - AU4 CHECK THE HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) CIRCUITS BETWEEN THE GWM (GATEWAY MODULE A) AND THE DLC (DATA LINK CONNECTOR) FOR AN OPEN
- Disconnect: GWM C2431 .
- Measure:
Positive Lead Measurement / Action Negative Lead C2431-18 (component side) C251-3 C2431-17 (component side) C251-11
Are the resistances less than 3 ohms?
Yes GO to AU5 No GO to AU11 - AU5 CHECK THE MS-CAN (MEDIUM SPEED-CONTROLLER AREA NETWORK) TERMINATION RESISTANCE
- Disconnect: GWM C2431 .
Is the resistance between 108 and 132 ohms?
Yes GO to AU6 No GO to Pinpoint Test Q - AU6 CHECK THE MS-CAN (MEDIUM SPEED-CONTROLLER AREA NETWORK) TERMINATION RESISTANCE, COMPONENT SIDE
- Disconnect: GWM C2431 .
- Measure:
Positive Lead Measurement / Action Negative Lead C2431-23 (component side) C2431-22 (component side)
Is the resistance between 108 and 132 ohms?
Yes GO to AU7 No GO to AU11 - AU7 CHECK THE HS-CAN3 (HIGH-SPEED CONTROLLER AREA NETWORK 3) TERMINATION RESISTANCE
Is the resistance between 108 and 132 ohms?
Yes GO to AU8 No GO to Pinpoint Test N - AU8 CHECK THE HS-CAN3 (HIGH-SPEED CONTROLLER AREA NETWORK 3) TERMINATION RESISTANCE, COMPONENT SIDE
- Measure:
Positive Lead Measurement / Action Negative Lead C2431-16 (component side) C2431-15 (component side)
Is the resistance between 108 and 132 ohms?
Yes GO to AU9 No GO to AU11 - Measure:
- AU9 CHECK THE GWM (GATEWAY MODULE A) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
- Connect negative battery cable.
Is the voltage greater than 11 volts?
Yes GO to AU10 No VERIFY the BCM fuse 12 (7.5A) or fuse 15 (10A) is OK. If OK, REPAIR the circuit. If not OK, Refer to the Wiring Diagram Information to identify the possible causes of the circuit short. - AU10 CHECK THE GWM (GATEWAY MODULE A) GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
Are the resistances less than 3 ohms?
Yes GO to AU11 No REPAIR the circuit in question. - AU11 CHECK FOR CORRECT GWM (GATEWAY MODULE A) OPERATION
- Ignition OFF.
- Disconnect and inspect the GWM 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 GWM 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 GWM. REFER to: Gateway Module A (GWM) . 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.