DTC B12F1: Power Control Unit Lost Communication With Remote Slot Control Unit

WARNING: This page is about a different car, the 2010 Acura TL and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Insert the remote into the remote slot.
Clear the DTCs with the HDS.
Do this procedure 10 times: Press the engine start/stop button to select the OFF, ACC, ON, and OFF mode.
Check for DTCs with the HDS.
Is DTC B12F1 indicated?

YES -Go to step 5.

NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections.
Select ONE-PUSH START from the system select menu with the HDS.
Select the KEY SLOT UNIT and check for DTCs with the HDS.
Are any DTCs indicated?

YES -Go to the INDICATED DTC'S TROUBLESHOOTING .

NO -Go to step 7.
Press the engine start/stop button to select the OFF mode.
Disconnect power control unit connector C (36P).
Disconnect the remote slot control unit 40P connector.
Disconnect the electric steering lock 12P connector.
Disconnect keyless access control unit connector B (32P).
Check for continuity between body ground and power control unit connector C (36P) terminal No. 2.

Fig 1: Checking Continuity Between Body Ground And Power Control Unit Connector C (36P) Terminal No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair a short to ground in the wire.

NO -Go to step 13.
Check for continuity between remote slot control unit 40P connector terminal No. 32 and power control unit connector C (36P) terminal No. 2.

Fig 2: Checking Continuity Between Remote Slot Control Unit 40P Connector Terminal No. 32 And Power Control Unit Connector C (36P) Terminal No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 14.

NO -Repair an open or high resistance in the wire.
Reconnect these items:
- Power control unit connector C (36P).
- Remote slot control unit 40P connector.
- Electric steering lock 12P connector.
- Keyless access control unit connector B (32P).
Do the battery terminal disconnect procedure (see BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).
Wait for at least 10 seconds to clear the DTCs.
Do the battery terminal reconnection procedure (see BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).
Turn the keyless access system mode switch ON.
If necessary, remove the remote from the remote slot.
Press the engine start/stop button to select the ON mode, then select the OFF mode.
Insert the remote into the remote slot.
Press and hold the engine start/stop button to select the ON mode.
Does the mode change to ON?

YES -Go to step 23.

NO -Go to step 26.
Clear the DTCs with the HDS.
Do this procedure 10 time: Press the engine start/stop button to select the OFF, ACC, ON, and OFF mode.
Check for DTCs with the HDS.
Is DTC B12F1 indicated?

YES -Replace the remote slot control unit (see REMOTE SLOT CONTROL UNIT ).

NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections.
Connect the HDS to the data link connector.
Select COMMUNICATION STATUS in the INSPECTION MENU with the HDS.

Check the value of STATUS with ESL, STATUS with KEYLESS ACCESS CONTROL UNIT, and STATUS with SLOT with the HDS.

COMMUNICATION STATUS

	HDS Description	Value
Status with ESL	MTR CUT1 (Cont) Status	1
	MTR CUT2 (IG) Status	1
	IG1 Input State of ESL	1
	MTRCONT Status of ESL	1
	ESL Motor Status	1
	Switch D detection for Unlock Status	1
	Switch C detection for Unlock Status	1
	Switch B detection for Unlock Status	1
Status with KEYLESS ACCESS CONTROL UNIT	FOR KEY Authentication Result	1
Status with SLOT	FOR KEY Authentication Result	1

Are only values of status with SLOT 1?

YES -Replace the remote slot control unit (see REMOTE SLOT CONTROL UNIT ).

NO -Replace the power control unit (see POWER CONTROL UNIT ).