DTC B1142-12: Telematics Communication Unit Power Supply Circuit (IG1) Malfunction (Telematics Communication Unit): 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 B1142:12 (TELEMATICS COMMUNICATION UNIT) DETECTION CONDITION AND POSSIBLE CAUSE
| System malfunction location |
Telematics communication unit power supply circuit (IG1) malfunction |
| Detection condition |
- The telematics communication unit detects a short to power supply in the power supply circuit (IG1).
Preconditions
- The ignition switched off or ACC.
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| Fail-safe |
Not applicable |
| Possible cause |
- IG1 relay No. 2 malfunction
- DTCs are stored in the body control module (BCM).
- Body control module (BCM) connector or terminal malfunction
- Short to power supply in body control module (BCM) IG1 relay circuit
- Telematics communication unit connector or terminal malfunction
- Short to power supply in telematics communication unit IG1 relay circuit
- Telematics communication unit malfunction
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 Courtesy of MAZDA MOTORS CORP.
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