DTC B12D0: Power control unit IG1A circuit error

DTC (Power Control Unit)

NOTE:  If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .

NOTE:  Make sure aftermarket accessories are not installed.

1. Problem verification:

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTCs with the HDS.

   - 3. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

   - 4. Wait 10 seconds.

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

   - 6. Wait 5 seconds.

   - 7. Turn the vehicle to the ON mode.

   - 8. Check for DTCs with the HDS.

   DTC Description	DTC
   B12D0 Power control unit IG1A circuit error

   Is DTC B12D0 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time.

2. Determine possible failure area (IG1a relay circuit ON problem, IG1a relay circuit OFF problem):

   - 1. Select KEYLESS ACCESS CONTROL from the ONE-PUSH START system select menu with the HDS, and enter DATA LIST.

   One-Push - KEYLESS ACCESS CONTROL UNIT - DATA LIST

   - 2. Check the IG1A with the HDS.

   Is there battery voltage?

   YES 

   Go to step 3.

   NO 

   Go to step 4.

3. Under-dash subrelay box test (IG1a relay circuit):

   Do the under-dash subrelay box test (IG1a relay circuit) .

   Is IG1a relay circuit OK?

   YES 

   Repair a short to power in the IG1-A SIG wire.

   NO 

   Faulty IG1a relay circuit, replace the under-dash subrelay box .

4. Under-dash subrelay box test (IG1a relay circuit):

   Do the under-dash subrelay box test (IG1a relay circuit) .

   Is IG1a relay circuit OK?

   YES 

   Repair an open or high resistance in the IG1-A SIG wire.

   NO 

   Faulty IG1a relay circuit, replace the under-dash subrelay box .