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Home >> Ford >> 2021 >> Mustang Mach 1, Automatic Trans >> Repair and Diagnosis >> Electrical >> Gauges >> Instrumentation, Message Center And Warning Chimes (2 Of 2) >> Diagnosis And Testing >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test Z: The SEATBELT Warning Indicator Is Never Or Always On

Pinpoint Test Z: The SEATBELT Warning Indicator Is Never Or Always On

  1. Normal Operation and Fault Conditions 

    See Seatbelt Warning Indicator. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

    If the driver seatbelt buckle status is missing for less than 5 seconds, the IPC defaults the seatbelt warning indicator to its last indication state (on or off), based upon the last message received.

    If the driver seatbelt buckle status message is missing for 5 seconds or longer, the IPC defaults the seatbelt warning indicator off.

    Possible Sources 

    • Driver seatbelt buckle concern
    • Communication concern
    • GWM concern
    • RCM
    • IPC

  2. Z1 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST

    • Ignition ON.

    • Using a diagnostic scan tool, perform the IPC self-test.

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to DTC Chart: Instrument Panel Cluster (IPC) .
    No  GO to  Z2

  3. Z2 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, check the GWM Continuous Memory Diagnostic Trouble Codes (CMDTCs).

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: Communications Network
    No  GO to  Z3

  4. Z3 CHECK THE DRIVER SEATBELT BUCKLE STATUS

    • Using a diagnostic scan tool, monitor the RCM driver seatbelt buckle PID (SBELT_D_ST) while buckling and unbuckling the driver seatbelt.

    Does the PID display BUCKLED with the seatbelt buckled and UNBUCKLED with the seatbelt unbuckled? 

    Yes  GO to  Z4
    No  INSTALL a new seatbelt buckle. REFER to: Front Seatbelt Buckle

  5. Z4 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) INDICATOR LAMP CONTROL ACTIVE COMMAND USING A DIAGNOSTIC SCAN TOOL

    • Using a diagnostic scan tool, view the IPC Parameter Identifications (PIDs).

    • Select the IPC seatbelt warning indicator (SBLT_LAMP) PID.

    • Command the seatbelt warning indicator on and off while observing the seatbelt warning indicator.

    Does the seatbelt warning indicator illuminate when commanded on and turn off when commanded off? 

    Yes  INSTALL a new RCM. REFER to: Restraints Control Module (RCM)
    No  INSTALL a new IPC. Refer to Instrument Panel Cluster (IPC) .
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