B1347

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DTC B1347, B1348
Mixed-air sensor, shorting to ground or open circuit/shorting to battery positive.

Conditions
B1347: Control module input pin 32, shorted to ground.
B1348: Control module input pin 32, open circuit or shorted to battery positive.

Diagnostic procedure

NOTE: If diagnostic trouble code B1515 has been generated it should be dealt with first.B1515

1. Connect the ISAT and obtain a "MIXED AIR SENSOR" readout.
The voltage should be within 1-4 V and change when the selected indoor temperature is changed.
2. Unplug the 10-pin connector (H10-5) and check the voltage across connector pins 9 and 10. It should be about 4.5 - 5 V. if it is not, proceed to point 4.
3. Measure the resistance across the mixed air sensor. It should vary with the temperature of the ambient air as shown in the table.
Install a new mixed air sensor if the resistance is not OK. Clear the trouble code and check that it is not generated afresh.
4. Unplug the ACC control module's connector. Connect a BOB to the wiring and check the leads for continuity and/or shorting as follows:
- across pin 14 of the ACC control module's connector and pin 9 of the sensor's connector H10-5
- across pin 32 of the ACC control module's connector and pin 10 of the sensor's connector H10-5.
Rectify any faulty lead in the wiring.
5. If the fault persists, proceed to "Before Changing A Control Module". Testing and Inspection