Honda Pilot: Seat Heater Test

Test

NOTE:

• SRS components are located in this area. Review the SRS component locations and the precautions and procedures before doing repairs or service.
• NOTE: For models with ventilated seat, refer to Seat Heater Test.

Driver's Seat (Without Ventilated Seat)

1. Driver's Seat - Remove

2. Driver's Seat Heater - Test

Seat Cushion Heater (With power seat)

1. Disconnect the connector A.
2. Check for continuity between the terminals according to the table.

3. If the continuity is not as specified, replace the driver's seat cushion heater.

Seat Cushion Heater (Without power seat)

Seat-Back Heater

4. Remove the driver's seat-back cover/pad as needed.
5. Disconnect the connector B.
6. Check for continuity between the terminals according to the table.

7. If the continuity is not as specified, replace the driver's seat-back heater.

3. All Removed Parts - Install

1. Install the parts in the reverse order of removal.

Front Passenger's Seat (Without Ventilated Seat)

1. Front Passenger's Seat - Remove

2. Front Passenger's Seat - Heater Test

Seat Cushion Heater

1. Disconnect the front passenger's seat cushion heater connector A.
2. Check for continuity between the terminals according to the table.

3. If the continuity is not as specified, replace the front passenger's seat cushion heater.

Seat-Back Heater

4. Remove the front passenger's seat-back cover/pad as needed.
5. Disconnect the front passenger's seat-back heater connector B.
6. Check for continuity between the terminals according to the table.

7. If the continuity is not as specified, replace the front passenger's seat-back heater.

3. All Removed Parts - Install

1. Install the parts in the reverse order of removal.

Second Row Seat

1. Second Row Seat - Remove

2. Second Row Seat Heater - Test

1. Disconnect the second row seat cushion heater connector A.
2. Check for continuity between the terminals according to the table.

3. If the continuity is not as specified, replace the second row seat cushion heater.

4. Remove the second row seat-back cover/pad as needed.
5. Disconnect the second row seat-back heater connector B.
6. Check for continuity between the terminals according to the table.

7. If the continuity is not as specified, replace the second row seat-back heater.

3. All Removed Parts - Install

1. Install the parts in the reverse order of removal.

Second Row 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 No. B16 (20 A) fuse in the auxiliary under-hood fuse/relay box is OK.
• Before testing, make sure the No. C29 (7.5 A)*2 fuse in the under-dash fuse/relay box is OK.
• Before testing, make sure the No. D1 (7.5 A)*1 fuse in the auxiliary under-dash fuse/relay box is OK.

*1: With auto idle stop system
*2: Without auto idle stop system

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

*1: With auto idle stop system
*2: Without auto idle stop system

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 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 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. B1-6 (20 A) fuse in the auxiliary under-hood fuse/relay box Faulty second row seat heater relay An open or high resistance in the wire
9*2	LT GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. C29 (7.5 A) fuse in the under-dash fuse/relay box Blown No. B1-6 (30 A) fuse in the auxiliary under-hood fuse/relay box Faulty IG1A relay in the under-dash fuse/relay box An open or high resistance in the wire
9*1	GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D1 (7.5 A) fuse in the auxiliary under-dash fuse/relay box Blown No. B14 (20 A) fuse in the auxiliary under-hood fuse/relay box Faulty DCDC converter Faulty DCDC converter IG1 relay 1 An open or high resistance in the wire
14	BRN	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G603) An open or high resistance in the ground wire
4	BRN	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G603) An open or high resistance in the ground wire
1	RED	Vehicle ON mode, left second row seat heater switch pressed	Measure the voltage to ground: There should be battery voltage.	Faulty left second row seat heater Poor ground (G603) or an open in the ground wire An open or high resistance in the wire
3	LT BLU	Vehicle ON mode, right second row seat heater switch pressed	Measure the voltage to ground: There should be battery voltage.	Faulty right second row seat heater Poor ground (G603) or an open in the ground wire An open or high resistance in the wire

*1: With auto idle stop system
*2: Without auto idle stop system

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

5. 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	TAN*1 BLU*2	Under all conditions	Check for continuity between terminal 10 and climate control unit connector A (32P) terminal No. 24: There should be continuity.	An open in the B-CAN wire Faulty climate control unit
11	WHT*1 PNK*2		Check for continuity between terminal 11 and climate control unit connector A (32P) terminal No. 23: There should be continuity.
7	PUR	Under all conditions	Check for continuity between terminals No. 7 and No. 13: There should be continuity.	Faulty left second row seat cushion heater An open or high resistance in the wire
13	WHT
6	GRN	Under all conditions	Check for continuity between terminals No. 6 and No. 12: There should be continuity.	Faulty right second row seat cushion heater An open or high resistance in the wire
12	BRN

*1: With auto idle stop system
*2: Without auto idle stop system