LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2021 >> CX-30 Turbo Premium >> Repair and Diagnosis >> External Pages >> Different car >> Section 82 (On-Board Diagnostic - Airbag System) >> DTC B1128-11, B1128-12, B1128-13, B1128-19 Or B1128-1A: Driver-Side Curtain Air Bag Module Circuit (Airbag) (Us) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
DTC B1128:11, B1128:12, B1128:13, B1128:19 OR B1128:1A DIAGNOSTIC PROCEDURE

Step Inspection Results Action
1 INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE CONNECTOR
WARNING:
Yes Replace the malfunctioning part and perform the repair completion verification.
No Go to the next step.
2 INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE DEPLOYMENT SIGNAL CIRCUIT FOR SHORT TO GROUND
 Yes Go to the next step.
No Repair or replace the malfunctioning location and perform the repair completion verification.
3 INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE DEPLOYMENT SIGNAL CIRCUIT FOR OPEN CIRCUIT
  • Driver-side curtain air bag module and SAS control module connectors are disconnected.
  • Inspect the driver-side curtain air bag module deployment signal circuit for short to each other. (See CIRCUIT INSPECTION .)
    NOTE:
    • Inspect for continuity while shaking the wiring harness between the SAS control module and driver-side curtain air bag module.
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the malfunctioning location and perform the repair completion verification.
4 INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE CIRCUIT FOR SHORT TO EACH OTHER
  • Driver-side curtain air bag module and SAS control module connectors are disconnected.
  • Inspect the driver-side curtain air bag module deployment signal circuit for short to each other. (See CIRCUIT INSPECTION .)
    NOTE:
    • Inspect for short to each other while shaking the wiring harness between the SAS control module and driver-side curtain air bag module.
  • Is the circuit normal?
 Yes Go to the next step.
No Repair or replace the malfunctioning location and perform the repair completion verification.
5 INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE DEPLOYMENT SIGNAL CIRCUIT FOR SHORT TO OTHER AIR BAG MODULE CIRCUIT
  • Driver-side curtain air bag module and SAS control module connectors are disconnected.
  • Other air bag module, pre-tensioner seat belt connectors are disconnected.
  • Refer to the wiring diagram and inspect for continuity between the following terminals and other air bag module/pre-tensioner seat belt terminals (wiring harness-side).
    • SAS control module terminal 2AJ
    • SAS control module terminal 2AN
    NOTE:
    • Inspect for continuity while shaking the wiring harness between the SAS control module and driver-side curtain air bag module.
  • Is there continuity?
 Yes Repair or replace the malfunctioning location and perform the repair completion verification.
No Go to the next step.
6 INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE CIRCUIT FOR SHORT TO POWER SUPPLY
  • Driver-side curtain air bag module and SAS control module connectors are disconnected.
  • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
  • Switch the ignition ON (engine off or on).
  • Inspect the driver-side curtain air bag module deployment signal circuit for a short to power supply. (See CIRCUIT INSPECTION .)
    NOTE:
    • Inspect for a short to power supply while shaking the wiring harness between the SAS control module and driver-side curtain air bag module.
  • Is the circuit normal?
 Yes Go to the next step.
No Repair or replace the malfunctioning location and perform the repair completion verification.
7 INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE
  • Switch the ignition off.
  • Disconnect the negative battery terminal and wait for 1 min or more. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
  • Connect the SAS control module connectors.
  • Except for the driver-side curtain air bag module connector, reconnect all disconnected connectors.
  • Apply 2 ohms resistance to the driver-side curtain air bag module connector terminals A and B (wiring harness-side).
  • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
  • Switch the ignition ON (engine off or on).
  • Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC .)
  • Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION .)
  • Are the same Pending DTCs present?
 Yes Perform the repair completion verification.
No Replace the driver-side curtain air bag module and perform the repair completion verification.
(See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .)
Repair completion verification PERFORM SAS CONTROL MODULE DTC INSPECTION
 Yes Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW (US) .)
If the CAN communication is normal, perform the diagnosis from Step 1.
No DTC troubleshooting completed.
scientia non olet · About LEMON Manuals