Pinpoint Test Q : B1474:11, B1474:15, B147A:11, B147A:15, B147B:11, B147B:15: Notes
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Refer to Auxiliary Heating for schematic and connector information.
Normal Operation and Fault Conditions
Electric Booster Heater, REFER to: Supplemental Climate Control - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1474:11 | Heater Relay 1: Circuit Short To Ground | This DTC sets when the control module senses lower than expected voltage on the PTC heater relay control circuit, indicating a short to ground. |
| B1474:15 | Heater Relay 1: Circuit Short To Battery or Open | This DTC sets when the control module senses higher than expected voltage on the PTC heater relay control circuit, indicating a short to voltage or an open circuit or sensor. |
| B147A:11 | Heater Relay 2: Circuit Short To Ground | This DTC sets when the control module senses lower than expected voltage on the PTC heater relay control circuit, indicating a short to ground. |
| B147A:15 | Heater Relay 2: Circuit Short To Battery or Open | This DTC sets when the control module senses higher than expected voltage on the PTC heater relay control circuit, indicating a short to voltage or an open circuit or sensor. |
| B147B:11 | Heater Relay 3: Circuit Short To Ground | This DTC sets when the control module senses lower than expected voltage on the PTC heater relay control circuit, indicating a short to ground. |
| B147B:15 | Heater Relay 3: Circuit Short To Battery or Open | This DTC sets when the control module senses higher than expected voltage on the PTC heater relay control circuit, indicating a short to voltage or an open circuit or sensor. |
Possible Sources
- Wiring, terminals or connectors
- Electric booster heater relays
- FCIM
Visual Inspection and Diagnostic Pre-checks
- VERIFY BJB fuses 46 (50A), 47 (50A) and 53 (50A) are OK.