DTC B12D4

DTC B12D4  : Starter Request Output Circuit Malfunction

NOTE:  If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .

DTC (Power Control Unit)

1. Problem verification

   -1. Clear the DTCs with the HDS.

   -2. Turn the vehicle to the READY TO DRIVE, OFF (LOCK) mode 5 times.

   -3. Check for DTCs with the HDS.

   DTC Description	DTC
   B12D4 Starter request output circuit malfunction

   Is DTC B12D4 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

2. Shorted wire check (STS line to power)

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

   -2. Jump the SCS line with the HDS, and wait more than 1 minute.

   SCS short

   -3. Disconnect the following connectors.

   PCM connector A (50P)

   Body control module connector C (66P)

   -4. Turn the vehicle to the ON mode.

   -5. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode PCM connector A (50P): disconnected Body control module connector C (66P): disconnected
   Test point 1	PCM connector A (50P) No. 28
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   Repair a short to power in the wire.

   NO 

   The STS wire is not shorted to power. Go to step 3.

3. Shorted wire check (STS line to ground)

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

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

   Test condition	Vehicle OFF (LOCK) mode PCM connector A (50P): disconnected Body control module connector C (66P): disconnected
   Test point 1	PCM connector A (50P) No. 28
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the wire.

   NO 

   The STS wire is not shorted to ground. Go to step 4.

4. Body control module internal short check

   -1. Connect the following connector.

   Body control module connector C (66P)

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

   Test condition	Vehicle OFF (LOCK) mode PCM connector A (50P): disconnected
   Test point 1	Body control module connector C (66P) No. 51
   Test point 2	Body ground

   Is there 4.37 V or more?

   YES 

   Replace the body control module .

   NO 

   Go to step 5.

5. Body control module internal open check

   -1. With the brake pedal pressed, push the power switch button continuously.

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

   Test condition	Vehicle OFF (LOCK) mode PCM connector A (50P): disconnected
   Test point 1	Body control module connector C (66P) No. 51
   Test point 2	Body ground

   Does the voltage vary from 1.72 V or less?

   YES 

   Replace the PCM .

   NO 

   Replace the body control module .