DTC : B12D2

DTC B12D2 : Power Control Unit IG2 Circuit Error

DTC Description	DTC
B12D2 Power Control Unit IG2 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 - Go to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .
Make sure aftermarket accessories are not installed.

Problem verification

- 1. Clear the DTCs with the HDS.

Clear DTCs

- 2. Turn the vehicle to the ON mode.

- 3. Wait 10 seconds.

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

- 5. Wait 5 seconds.

- 6. Check for DTCs with the HDS.

DTC Description	DTC
B12D2 Power Control Unit IG2 Circuit Error

Is DTC B12D2 indicated?

YES

Go to step 2.

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

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

-1. Turn the vehicle to the ON mode.

- 2. Check the parameter(s) below with the HDS.

Signal	Current conditions
Signal	Value	Unit
IG2

- 3. Check the IG2 with the HDS.

Is there battery voltage?

YES

Go to step 3.

Go to step 4.

IG2-MAIN line test

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

- 2. Disconnect the following connector.

Keyless access/TPMS control unit connector B (36P)

Under-dash fuse/relay box connector M (12P)

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

Test condition	Vehicle OFF (LOCK) mode
	Keyless access/TPMS control unit connector B (36P): Disconnect
	Under-dash fuse/relay box connector M (12P): Disconnect
Test point 1	Under-dash fuse/relay box connector M (12P) No. 10
Test point 2	Body ground

Is there continuity?

YES

Repair a short to power in the IG2-MAIN wire between the under-dash fuse/relay box and the keyless access/TPMS control unit.

Faulty IG2 relay circuit, replace the Under-Dash Fuse/Relay Box - Removal and Installation .