DTC U2633-14: Light Control Module (LH) Power Supply Circuit (IG+) Malfunction (BCM): Outline
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 U2633:14 (BCM) DETECTION CONDITION AND POSSIBLE CAUSE
| System malfunction location |
Light control module (LH) power supply circuit (IG+) malfunction |
| Detection condition |
- The light control module (LH) (built into front combination light (LH)) detects an open circuit in the power supply circuit (IG+).
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| Fail-safe |
Not applicable |
| Possible cause |
- IG1 relay No. 2 malfunction and headlight relay malfunction
- Open circuit in following circuits:
- Headlight relay ground circuit
- Headlight relay power supply circuit
- Power supply circuit between IG1 relay No. 2 and headlight relay
- Short to ground in power supply circuit between IG1 relay No. 2 and headlight relay
- Front combination light (LH) connector or terminal malfunction
- Open circuit in front combination light (LH) power supply circuit (IG+)
- Front combination light (LH) internal malfunction
- Body control module (BCM) malfunction
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 Courtesy of MAZDA MOTORS CORP.
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