Seat Heater Control Unit Input Test/Replacement

NOTE:

SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ), and precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before doing repairs or servicing.
Before testing, make sure the No. 1 (MAIN) (120 A) and No. 2 (IG) (50 A) fuse in the under-hood fuse/relay box are OK.
Before testing, troubleshoot the multiplex integrated control system first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Turn the ignition switch to LOCK (0).
Remove the seat heater control unit (A).
Disconnect the 14P connector (B) from the seat heater control unit.

Fig 1: Identifying Seat Heater Control Unit And 14P Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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 5.

Reconnect the 14P 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 6.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
2	YEL	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. 10 (7.5 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
1	LT BLU	In all ignition switch positions	Measure the voltage to ground: There should be battery voltage.	Blown No. 15 (20 A) fuse in the auxiliary under-hood fuse/relay box An open or high resistance in the wire
8	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G502) An open or high resistance in the ground wire
14	LT BLU	Ignition switch ON (II) and front passenger's seat heater switch ON (LOW or HIGH)	Measure the voltage to ground: There should be battery voltage.	Faulty front passenger's seat cushion heater An open or high resistance in the wire
7	LT GRN	Ignition switch ON (II) and driver's seat heater switch ON (LOW or HIGH)	Measure the voltage to ground: There should be battery voltage.	Faulty driver's seat cushion heater An open or high resistance in the wire

Disconnect the 14P 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
10	PNK	Under all conditions	Check for continuity between terminal No. 4 and No. 10: There should be continuity.	Faulty driver's seat cushion heater An open or high resistance in the wire
4	ORN	Under all conditions
11	BRN	Under ail conditions	Check for continuity between terminal No. 5 and No. 11: There should be continuity.	Faulty front passenger's seat cushion heater An open or high resistance in the wire
5	GRN	Under ail conditions