DTC B2980 (2) (HVAC Control Unit)

DTC B2980 or DTC indicator 2  : A short in the A/C pressure sensor circuit

DTCs (AC)

1. Problem verification

   -1. Clear the DTC with the HDS.

   -2. Turn the vehicle to the OFF (LOCK) mode, then the ON mode.

   -3. Do the Self-Diagnostic Function with the HDS or the HVAC control unit .

   -4. Check for DTCs.

   DTC Description	DTC
   B2980 A short in the A/C pressure sensor circuit

   Is DTC B2980 or 2 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure. Check for loose wires or poor connections on the A/C pressure sensor circuit.

2. Shorted wire check (SENSOR 5V line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connectors.

   HVAC control unit connector A (32P)

   A/C pressure sensor 3P connector

   -3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	HVAC control unit connector A (32P): disconnected
   	A/C pressure sensor 3P connector: disconnected
   Test point 1	HVAC control unit connector A (32P) No. 5
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the wire between the HVAC control unit and the A/C pressure sensor.

   NO 

   The SENSOR 5V wire is not shorted. Go to step 3.

3. Shorted wire check (PD SENSOR line)

   -1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	HVAC control unit connector A (32P): disconnected
   	A/C pressure sensor 3P connector: disconnected
   Test point 1	HVAC control unit connector A (32P) No. 20
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the wire between the HVAC control unit and the A/C pressure sensor.

   NO 

   The PD SENSOR wire is not shorted. Go to step 4.

4. Shorted wire check (PD SENSOR line to SENSOR(COM) line)

   -1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	HVAC control unit connector A (32P): disconnected
   	A/C pressure sensor 3P connector: disconnected
   Test point 1	HVAC control unit connector A (32P) No. 18
   Test point 2	HVAC control unit connector A (32P) No. 20

   Is there continuity?

   YES 

   Repair a short in the wires between the HVAC control unit and the A/C pressure sensor.

   NO 

   The PD SENSOR wire to SENSOR(COM) wire are not shorted. Go to step 5.

5. HVAC control unit check 1

   -1. Reconnect the HVAC control unit connector A (32P).

   -2. Turn the vehicle to the ON mode.

   -3. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	A/C pressure sensor 3P connector: disconnected
   Test point 1	HVAC control unit connector A (32P) No. 5
   Test point 2	HVAC control unit connector A (32P) No. 18

   Is there about 5 V?

   YES 

   Go to step 6.

   NO 

   Replace the HVAC control unit .

6. HVAC control unit check 2

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	A/C pressure sensor 3P connector: disconnected
   Test point 1	HVAC control unit connector A (32P) No. 18
   Test point 2	HVAC control unit connector A (32P) No. 20

   Is there about 5 V?

   YES 

   Replace the A/C pressure sensor .

   NO 

   Replace the HVAC control unit .