Control Unit Input Test/Replacement

NOTE: Before testing, check the No. 2-4 (AS F/B OPTION) (40 A) fuse in the under-hood fuse/relay box, the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box, and the No. 19 (20 A) fuse in the passenger's under-dash fuse/relay box.

Remove the driver's center console trim (see CENTER CONSOLE REMOVAL/INSTALLATION ).
Disconnect the 37P connector (A) from the seat ventilation control unit (B).

Fig 1: Identifying Seat Ventilation Control Unit 37P 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 4.

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 5.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
12	RED	Power mode ON	Measure the voltage to ground: There should be battery voltage.	Blown No. 19 (20 A) fuse in the passenger's under-dash fuse/relay box Faulty seat ventilation relay An open or high resistance in the wire
26	ORN	Power mode ON	Measure the voltage to ground: There should be battery voltage.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
13	GRY	Combination light switch (PARKING position) ON	Measure the voltage to ground: There should be battery voltage.	Blown No. 6 (7.5 A) fuse in the passenger's under-dash fuse/relay box An open or high resistance in the wire
24	LT BLU	Power mode ON, front passenger's seat heat switch pressed	Measure the voltage to ground: There should be battery voltage.	Faulty front passenger's seat heater Poor ground (G651) or an open in the ground wire An open or high resistance in the wire
37	LT GRN	Power mode ON, driver's seat heat switch pressed	Measure the voltage to ground: There should be battery voltage.	Faulty driver's seat heater Poor ground (G602) or an open in the ground wire An open or high resistance in the wire
25	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

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
5	PNK	Power mode ON	Connect to ground with a jumper wire: The front passenger's seat heater HIGH indicator should come on.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty front passenger's seat ventilation switch An open or high resistance in the wire
31	LT GRN	Power mode ON	Connect to ground with a jumper wire: The front passenger's seat heater MIDDLE indicator should come on.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty front passenger's seat ventilation switch An open or high resistance in the wire
6	BRN	Power mode ON	Connect to ground with a jumper wire: The front passenger's seat heater LOW indicator should come on.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty front passenger's seat ventilation switch An open or high resistance in the wire
28	GRN	Power mode ON	Connect to ground with a jumper wire: The front passenger's seat ventilation HIGH indicator should come on.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty front passenger's seat ventilation switch An open or high resistance in the wire
2	WHT	Power mode ON	Connect to ground with a jumper wire: The front passenger's seat ventilation MIDDLE indicator should come on.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty front passenger's seat ventilation switch An open or high resistance in the wire
32	BLU	Power mode ON	Connect to ground with a jumper wire: The front passenger's seat ventilation LOW indicator should come on.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty front passenger's seat ventilation switch An open or high resistance in the wire
3	PNK	Power mode ON	Connect to ground with a jumper wire: The driver's seat heater HIGH indicator should come on.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's seat ventilation switch An open or high resistance in the wire
29	LT GRN	Power mode ON	Connect to ground with a jumper wire: The driver's seat heater MIDDLE indicator should come on.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's seat ventilation switch An open or high resistance in the wire
4	BRN	Power mode ON	Connect to ground with a jumper wire: The driver's seat heater LOW indicator should come on.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's seat ventilation switch An open or high resistance in the wire
27	LT BLU	Power mode ON	Connect to ground with a jumper wire: The driver's seat ventilation HIGH indicator should come on.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's seat ventilation switch An open or high resistance in the wire
1	PUR	Power mode ON	Connect to ground with a jumper wire: The driver's seat ventilation MIDDLE indicator should come on.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's seat ventilation switch An open or high resistance in the wire
30	BLU	Power mode ON	Connect to ground with a jumper wire: The driver's seat ventilation LOW indicator should come on.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's seat ventilation switch An open or high resistance in the wire
33	LT BLU	Power mode ON, front passenger's seat heat switch pressed	Measure the voltage to ground: There should be battery voltage.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty front passenger's seat ventilation switch An open or high resistance in the wire
7	PUR	Power mode ON, front passenger's seat ventilation switch pressed	Measure the voltage to ground: There should be battery voltage.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty front passenger's seat ventilation switch An open or high resistance in the wire
34	YEL	Power mode ON, driver's seat heat switch pressed	Measure the voltage to ground: There should be battery voltage.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's seat ventilation switch An open or high resistance in the wire
8	RED	Power mode ON, driver's seat ventilation switch pressed	Measure the voltage to ground: There should be battery voltage.	Blown No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's seat ventilation switch An open or high resistance in the wire
9	WHT	Under all conditions	Check for continuity between terminals No. 9 and No. 21: There should be continuity.	Faulty driver's seat cushion heater An open or high resistance in the wire
21	YEL	Under all conditions
20	GRN	Under all conditions	Check for continuity between terminals No. 20 and No. 36: There should be continuity.	Faulty front passenger's seat cushion heater An open or high resistance in the wire
36	BRN	Under all conditions