Front Seat Heater Control Unit Input Test

NOTE: Before testing, make sure the No. C19 (20 A), No. C24 (7.5 A), and No. C39 (10 A) fuses in the under-dash fuse/relay box are OK.

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. With the connector still disconnected, 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
13	RED	Under all conditions	Check for continuity between terminals No. 13 and No. 7:There should be continuity.	Faulty driver's seat cushion heater An open or high resistance in the wire
7	BLU	Under all conditions
12	GRN	Under all conditions	Check for continuity between terminals No. 12 and No. 6: There should be continuity.	Faulty front passenger's seat cushion heater An open or high resistance in the wire
6	WHT	Under all conditions

4. Reconnect the connector, 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, replace the front seat heater control unit .

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
2	LT GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. C19 (20 A) fuse in the under-dash fuse/relay box Faulty front seat heater relay An open or high resistance in the wire
9	LT GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. C39 (10 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
4	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G403) An open or high resistance in the ground wire
1	RED	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 (G403) or an open in the ground wire An open or high resistance in the wire
3	LT BLU	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 (G403) or an open in the ground wire An open or high resistance in the wire