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Home >> Mazda >> 2017 >> CX-3 Touring, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic - Electrical Supply Unit >> DTC B1D02-13; Headlight HI (LH) Circuit Malfunction >> Notes

DTC B1D02-13; Headlight HI (LH) Circuit Malfunction: Notes

DTC B1D02-13; HEADLIGHT HI (LH) CIRCUIT MALFUNCTION - DETECTION CONDITION & POSSIBLE CAUSE

Description Headlight HI (LH) circuit malfunction
Detection condition
  • Electrical supply unit (ESU) detects an open circuit in the headlight HI (LH) circuit.
Fail-safe Not applicable
Possible cause
  • Electrical supply unit (ESU) connector or terminal malfunction
  • Electrical supply unit (ESU) power supply circuit malfunction
    • Short to ground in wiring harness between MAIN 200 A fuse and electrical supply unit (ESU) terminal 4C
    • H/L LH 20 A fuse malfunction
    • MAIN 200 A fuse malfunction
    • Open circuit in wiring harness between battery positive terminal and electrical supply unit (ESU) terminal 4C
  • Headlight HI/LO bulb (LH) malfunction
  • Front combination light (LH) connector or terminal malfunction
  • Open circuit in wiring harness between the following terminals:
    • Front combination light (LH) terminal F-Body ground (With front combination light (bulb type))
    • Front combination light (LH) terminal O-Body ground (With front combination light (LED type))
  • Open circuit in wiring harness between front combination light (LH) terminal A and electrical supply unit (ESU) terminal 4A
  • Front combination light (LH) malfunction
  • Electrical supply unit (ESU) malfunction
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