Rear Seat Heater Control Unit Input Test

NOTE:

Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.
If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
Before testing, make sure the fuses associated with the system is OK.

1. Disconnect the 14P connector from the second row seat heater control unit.

REAR SEAT HEATER CONTROL UNIT 14P CONNECTOR (female terminals)

Courtesy of HONDA, U.S.A., INC.

2. Inspect the connector and socket terminals to be sure they are all making good contact:

If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
If the terminals look OK, go to step 3.

3. Reconnect the connector to the control unit, and do the following input tests:

If any test indicates a problem, find and correct the cause, then recheck the system.
If all the input tests prove OK, go to step 4.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
2	PNK	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Faulty rear seat heater relay An open or high resistance in the wire
9	GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	An open or high resistance in the wire
4	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G602) An open or high resistance in the ground wire
1	RED	Vehicle ON mode, left rear seat heater switch ON	Measure the voltage to ground: There should be battery voltage.	Faulty left rear seat heater Poor ground (G602) or an open in the ground wire An open or high resistance in the wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
3	LT BLU	Vehicle ON mode, right rear seat heater switch ON	Measure the voltage to ground: There should be battery voltage.	Faulty right rear seat heater Poor ground (G602) or an open in the ground wire An open or high resistance in the wire

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

5. Disconnect the connector from the control unit, and do the following input tests:

If any test indicates a problem, find and correct the cause, then recheck the system.
If all the input tests prove OK, the control unit must be faulty; replace it .

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
7	PUR	Under all conditions	Check for continuity between terminals No. 7 and No. 13: There should be continuity.	Faulty left rear seat heater thermister An open or high resistance in the wire
13	WHT	Under all conditions
6	GRN	Under all conditions	Check for continuity between terminals No. 6 and No. 12: There should be continuity.	Faulty right rear seat heater thermister An open or high resistance in the wire
12	BRN	Under all conditions