Front Seat Heater Control Unit Input Test

NOTE: Before testing, check the No. B3-3 (60 A) fuse in the main under-hood fuse box.

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 37P 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.	Blown No. E2 (20 A) fuse in the passenger's under-dash fuse/relay box Faulty front seat heater relay An open or high resistance in the wire
37	YEL	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D10 (7.5 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
26	YEL	Combination light switch (PARKING position) ON	Measure the voltage to ground: There should be battery voltage.	Blown No. E25 (7.5 A) fuse in the passenger's under-dash fuse/relay box 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 (G801) An open or high resistance in the ground wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
3	WHT	Vehicle ON mode, driver's seat heater switch pressed	Measure the voltage to ground: There should be battery voltage.	Faulty driver's seat heater Poor ground (G801) or an open in the ground wire An open or high resistance in the wire
1	WHT	Vehicle ON mode, front passenger's seat heater switch pressed	Measure the voltage to ground: There should be battery voltage.	Faulty front passenger's seat heater Poor ground (G802) 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 37P 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
13	RED	Vehicle ON mode	Connect to ground with a jumper wire: The driver's seat heater HIGH indicator should come on.	Blown No. D10 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's seat heater switch An open or high resistance in the wire
34	BLU	Vehicle ON mode	Connect to ground with a jumper wire: The driver's seat heater MIDDLE indicator should come on.	Blown No. D10 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's seat heater switch An open or high resistance in the wire
12	GRN	Vehicle ON mode	Connect to ground with a jumper wire: The driver's seat heater LOW indicator should come on.	Blown No. D10 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's seat heater switch An open or high resistance in the wire
11	GRY	Vehicle ON mode	Connect to ground with a jumper wire: The front passenger's seat heater HIGH indicator should come on.	Blown No. D10 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty front passenger's seat heater switch An open or high resistance in the wire
32	PUR	Vehicle ON mode	Connect to ground with a jumper wire: The front passenger's seat heater MIDDLE indicator should come on.	Blown No. D10 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty front passenger's seat heater switch An open or high resistance in the wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
10	LT GRN	Vehicle ON mode	Connect to ground with a jumper wire: The front passenger's seat heater LOW indicator should come on.	Blown No. D10 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty front passenger's seat heater switch An open or high resistance in the wire
29	LT GRN	Vehicle ON mode, driver's seat heater switch pressed	Measure the voltage to ground: There should be battery voltage.	Blown No. D10 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's seat heater switch An open or high resistance in the wire
30	BRN	Vehicle ON mode, front passenger's seat heater switch pressed	Measure the voltage to ground: There should be battery voltage.	Blown No. D10 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty front passenger's seat heater switch An open or high resistance in the wire
7	ORN	Under all conditions	Check for continuity between terminals No. 7 and No. 18: There should be continuity.	Faulty driver's seat cushion heater An open or high resistance in the wire
18	BLU	Under all conditions
27	PUR	Under all conditions	Check for continuity between terminals No. 27 and No. 19: There should be continuity.	Faulty front passenger's seat cushion heater An open or high resistance in the wire
19	LT GRN	Under all conditions