DTC Troubleshooting: B12D2

DTC B12D2: Power control unit IG2 circuit error

DTC Description	DTC
B12D2 Power control unit IG2 circuit error

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

NOTE: Make sure aftermarket accessories are not installed.

Problem verification:

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
B12D2 Power control unit IG2 circuit error

Is DTC B12D2 indicated?

Go to step 2.

Intermittent failure, the system is OK at this time.?

Determine possible failure area (IG2 relay circuit ON problem, IG2 relay circuit OFF problem):

Determine possible failure area (IG2 relay circuit ON problem, IG2 relay circuit OFF problem)

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

?2.	Check the IG2 with the HDS.

Is there battery voltage?

Go to step 3.

Go to step 4.

Under-dash subrelay box test (IG2 relay circuit):

Under-dash subrelay box test (IG2 relay circuit)

?1.	Do the under-dash subrelay box test (IG2 relay circuit).

Is IG1a relay circuit OK?

Repair a short to power in the IG2 SIG wire.?

Under-dash subrelay box test (IG2 relay circuit):

Under-dash subrelay box test (IG2 relay circuit)

?1.	Do the under-dash subrelay box test (IG2 relay circuit).

Is IG2 relay circuit OK?

Repair an open or high resistance in the IG2 SIG wire.?