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Home >> Mazda >> 2021 >> CX-30 Turbo Premium >> Repair and Diagnosis >> External Pages >> Different car >> Section 33 (On-Board Diagnostic - Dash-Electrical Supply Unit) >> DTC B1038-11: Seat Warmer Unit (LH) Circuit Malfunction (Thermistor Side) [Dash-Electrical Supply Unit (Us)] >> Without Position Memory System >> Diagnostic procedure

Diagnostic procedure

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DTC B1038:11 [DASH-ELECTRICAL SUPPLY UNIT (US)]

Step Inspection Results Action
1 INSPECT SEAT WARMER CONTROL UNIT CONNECTOR FOR MALFUNCTION
  • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION .)
  • Are the connector and terminal normal?
 Yes Go to the next step.
No Repair or replace the malfunctioning location and perform the repair completion verification.
2 INSPECT CONNECTOR C-61 FOR MALFUNCTION
  • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION .)
  • Are the connector and terminal normal?
 Yes Go to the next step.
No Repair or replace the malfunctioning location and perform the repair completion verification.
3 INSPECT SEAT WARMER UNIT (LH) SIGNAL CIRCUIT FOR SHORT TO GROUND
  • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION .)
  • Is the circuit normal?
 Yes Go to the next step.
No Repair or replace the malfunctioning location and perform the repair completion verification.
4 INSPECT SEAT WARMER UNIT (LH) FOR MALFUNCTION
  • Verify that the connector C-61 is disconnected.
  • Inspect for continuity between connector C-61 (seat (LH) harness-side) terminal 6D (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Repair or replace the malfunctioning location and perform the repair completion verification.
(See FRONT SEAT REMOVAL/INSTALLATION (US) .)
No Go to the next step.
5 INSPECT SEAT WARMER CONTROL UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY
  • Install/connect the part removed/disconnected during the troubleshooting procedure.
  • Clear the DTC recorded in the memory. (See CLEARING DTC .)
  • Perform the DTC inspection for the dash-electrical supply unit. (See DTC INSPECTION .)
  • Is the same Pending DTC present?
 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, replace the malfunctioning location and perform the repair completion verification.
(See SEAT WARMER CONTROL UNIT REMOVAL/INSTALLATION (US) .)
No Go to repair completion verification 2.
Repair completion verification 1 VERIFY THAT VEHICLE IS REPAIRED
  • Install/connect the part removed/disconnected during the troubleshooting procedure.
  • Clear the DTC recorded in the memory. (See CLEARING DTC .)
  • Perform the DTC inspection for the dash-electrical supply unit. (See DTC INSPECTION .)
  • Is the same Pending DTC present?
 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 Go to the next step.
Repair completion verification 2 VERIFY IF OTHER DTCs DISPLAYED
  • Perform the DTC inspection. (See DTC INSPECTION .)
  • Are any DTCs displayed?
 Yes Repair the malfunctioning location according to the applicable DTC troubleshooting.
No DTC troubleshooting completed.
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