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Honda Pilot Owners & Service Manuals

Honda Pilot: Keyless/Power Door Locks/Security System (MICU, Door Multiplex Control Unit, and Front Passenger's Power Window Switch) Input Test

Honda Pilot 2016-2022 (YF5/YF6) Service Manual / Parts Test Info / Keyless/Power Door Locks/Security System (MICU, Door Multiplex Control Unit, and Front Passenger's Power Window Switch) Input Test

NOTE:

  • 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. A4 (10 A), No. A8 (10 A), No. A10 (10 A), No. A13 (20 A), No. A25 (10 A), No. A26 (10 A), and No. A28 (10 A) fuses in the under-hood fuse/relay box are OK.
  • Before testing, make sure the No. C1 (20 A), No. C4 (20 A), No. C19 (10 A), No. C20 (10 A), No. C23 (7.5 A), No. C33 (10 A), No. C34 (20 A), No. C35 (10 A), and No. C41 (10 A) fuses in the under-dash fuse/relay box are OK.
  • Before testing, make sure the No. B1-6 (30 A) fuse in the auxiliary under-hood fuse/relay box is OK.
  • Before testing, make sure the headlights, parking lights, side marker lights, taillights, and horns work properly.
  • There are two pairs of fuses in the same circuit (No. C20 and No. C34 fuses, No. C19 and No. C41 fuses, No. C20 and No. C33 fuses). If one fuse is blown, make sure to check the other fuse in the same circuit. If necessary, replace the blown fuse(s).

MICU

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

2. Disconnect under-dash fuse/relay box connectors D, E, F, M, P, S, and T.

NOTE: All connector views are shown from the wire side of the female terminals.

Honda Pilot. Parts Test Info

3. Inspect the connectors 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.

4. With the connectors 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 5.

NOTE: These are door lock actuator operation tests for keyless entry.

Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
T6 RED Connect battery power*1 to T6 (or T5), and terminal T5 (or T6) and ground with jumper wires. Check actuator operation: The driver's door lock actuator should LOCK (or UNLOCK).
  • Faulty driver's door lock actuator
  • An open or high resistance in the wire
T5 TAN
S2 LT GRN Connect battery power*1 to S2 (or S5), and terminal S5 (or S2) and ground with jumper wires. Check actuator operation: The front passenger's door lock actuator and right rear door lock actuator should LOCK (or UNLOCK).
  • Faulty front passenger's door lock actuator
  • Faulty right rear door lock actuator
  • An open or high resistance in the wire
S5 TAN
D11 BLU Connect battery power*1 to D11 (or D12), and terminal D12 (or D11) and ground with jumper wires. Check actuator operation: The left rear door lock actuator should LOCK (or UNLOCK).
  • Faulty left rear door lock actuator
  • An open or high resistance in the wire
D12 YEL
D17*2 BLU Connect battery power*1 to D17 with a jumper wire. Check actuator operation: The tailgate release actuator should work.
  • Faulty tailgate release actuator
  • Poor ground (G604) or an open in the ground wire
  • An open or high resistance in the wire
E31 BLU Under all conditions Connect to ground with a jumper wire: The horns should sound.
  • Blown No. A28 (10 A) fuse in the under-hood fuse/relay box
  • Faulty horn relay
  • Faulty horn
  • An open or high resistance in the wire
E27*3 BLU TCM 58P connector disconnected Check for continuity between terminal E17 and the TCM 58P connector terminal No. 32: There should be continuity. An open or high resistance in the wire
P22 PNK Keyless access/TPMS control unit connector A (32P) disconnected Check for continuity between terminal P22 and the keyless access/TPMS control unit connector A (32P) terminal No. 2: There should be continuity. An open or high resistance in the wire

*1: Use a fused jumper wire with an appropriate amperage fuse.
*2: Without power tailgate
*3: 9-speed A/T

5. Reconnect the connectors to the under-dash fuse/relay box; 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
M9 WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
  • Blown No. A26 (10 A) fuse in the under-hood fuse/relay box
  • An open or high resistance in the wire
E32*4 BRN Vehicle ON mode Measure the voltage to ground: There should be battery voltage.
  • Blown No. D4 (7.5 A) fuse in the auxiliary under-dash fuse/relay box
  • Faulty DC-DC converter IG1 relay 2
  • An open or high resistance in the wire
F2 WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
  • Blown No. B1-6 (30 A) fuse in the auxiliary under-hood fuse/relay box An open or high resistance in the wire
D14 BLK In all power modes Measure the voltage to ground: There should be less than 0.2 V.
  • Poor ground (G601)
  • An open or high resistance in the ground wire
D42 BLK In all power modes Measure the voltage to ground: There should be less than 0.2 V.
  • Poor ground (G601)
  • An open or high resistance in the ground wire
P1 BLK In all power modes Measure the voltage to ground: There should be less than 0.2 V.
  • Poor ground (G401)
  • An open or high resistance in the ground wire
F7 BLK In all power modes Measure the voltage to ground: There should be less than 0.2 V.
  • Poor ground (G301)
  • An open or high resistance in the ground wire
D35 LT BLU Driver's door open Measure the voltage to ground: There should be less than 0.2 V.
  • Faulty driver's door switch
  • Faulty driver's door switch ground
  • An open or high resistance in the wire
Driver's door closed Measure the voltage to ground: There should be about 5 V.
  • Faulty driver's door switch
  • A short to ground in the wire
  • Faulty MICU
D37 BLU Front passenger's door open Measure the voltage to ground: There should be less than 0.2 V.
  • Faulty front passenger's door switch
  • Faulty front passenger's door switch ground
  • An open or high resistance in the wire
Front passenger's door closed Measure the voltage to ground: There should be about 5 V.
  • Faulty front passenger's door switch
  • A short to ground in the wire
  • Faulty MICU
D34 PNK Left rear door open Measure the voltage to ground: There should be less than 0.2 V.
  • Faulty left rear door switch
  • Faulty left rear door switch ground
  • An open or high resistance in the wire
Left rear door closed Measure the voltage to ground: There should be about 5 V.
  • Faulty left rear door switch
  • A short to ground in the wire
  • Faulty MICU
D28 GRN Right rear door open Measure the voltage to ground: There should be less than 0.2 V.
  • Faulty right rear door switch
  • Faulty right rear door switch ground
  • An open or high resistance in the wire
Right rear door closed Measure the voltage to ground: There should be about 5 V.
  • Faulty right rear door switch
  • A short to ground in the wire
  • Faulty MICU
D25 LT BLU Left rear door lock knob switch in UNLOCK Measure the voltage to ground: There should be less than 0.2 V.
  • Faulty left rear door lock knob switch
  • Poor ground (G601) or an open in the ground wire
  • An open or high resistance in the wire
Left rear door lock knob switch in LOCK Measure the voltage to ground: There should be about 5 V.
  • Faulty left rear door lock knob switch
  • A short to ground in the wire
  • Faulty MICU
D26 PUR Right rear door lock knob switch in UNLOCK Measure the voltage to ground: There should be less than 0.2 V.
  • Faulty right rear door lock knob switch
  • Poor ground (G603) or an open in the ground wire
  • An open or high resistance in the wire
Right rear door lock knob switch in LOCK Measure the voltage to ground: There should be about 5 V.
  • Faulty right rear door lock knob switch
  • A short to ground in the wire
  • Faulty MICU
D39*1 PNK Tailgate open Measure the voltage to ground: There should be less than 0.2 V.
  • Faulty closer unit
  • Faulty power tailgate control unit
  • An open or high resistance in the wire
Tailgate closed Measure the voltage to ground: There should be about 5 V.
  • Faulty closer unit
  • A short to ground in the wire
  • Faulty MICU
D39*2 PNK Tailgate open Measure the voltage to ground: There should be less than 0.2 V
  • Faulty tailgate latch switch
  • Poor ground (G604) or an open in the ground wire
  • An open or high resistance in the wire
Tailgate closed Measure the voltage to ground: There should be about 5 V.
  • Faulty tailgate latch switch
  • A short to ground in the wire
F16 GRN Hood closed Measure the voltage to ground: There should be less than 0.2 V.
  • Faulty security hood switch
  • Poor ground (G201) or an open in the ground wire
  • An open or high resistance in the wire
Hood open Measure the voltage to ground: There should be about 5 V.
  • Faulty security hood switch
  • A short to ground in the wire
  • Faulty MICU
E27*3 BLU Shift position/mode in P Measure the voltage to ground: There should be less than 0.2 V.
  • Faulty transmission range switch
  • Poor ground (G101) or an open in the ground wire
  • An open or high resistance in the wire
Shift position/mode in any other position/mode than P Measure the voltage to ground: There should be about 5 V.
  • Faulty transmission range switch
  • A short to ground in the wire
  • Faulty MICU

*1: With power tailgate
*2: Without power tailgate
*3: 6-speed A/T
*4: With auto idle stop system

Door Multiplex Control Unit

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

7. Disconnect the power window master switch 37P connector.

Honda Pilot. Parts Test Info

8. Inspect the connector and socket terminals to be sure they are all making good contact:

  • 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 9.

9. 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 10.
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
36 GRY Disconnect the front passenger's power window switch 24P connector and the moonroof motor-control unit 14P connector Check for continuity between terminal No. 36 and front passenger's power window switch 24P connector terminal No. 24: There should be continuity. An open in the LIN (P/W) wire
Check for continuity between terminal No. 36 and moonroof control unit/motor 14P connector terminal No. 12: There should be continuity. An open in the LIN (P/W) wire
Check for continuity to ground: There should be no continuity. A short to ground in the LIN (P/W) wire

10. Reconnect the connector, 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 11.
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
25 LT GRN Vehicle ON mode Measure the voltage to ground: There should be battery voltage.
  • Blown No. C23 (7.5 A) fuse in the under-dash fuse/relay box
  • An open or high resistance in the wire
26 WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
  • Blown No. A26 (10 A) fuse in the under-hood fuse/relay box
  • Faulty under-dash fuse/relay box
  • An open or high resistance in the wire
4 WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
  • Blown No. C1 (20 A) fuse in the under-dash fuse/relay box
  • An open or high resistance in the wire
3 BLK In all power modes Measure the voltage to ground: There should be less than 0.2 V.
  • Poor ground (G401)
  • An open or high resistance in the ground wire
31 BLK In all power modes Measure the voltage to ground: There should be less than 0.2 V.
  • Poor ground (G401)
  • An open or high resistance in the ground wire
35 PNK Driver's door key cylinder switch in LOCK Measure the voltage to ground: There should be less than 0.2 V.
  • Faulty driver's door key cylinder switch
  • Poor ground (G401) or an open in the ground wire
  • An open or high resistance in the wire
Driver's door key cylinder switch in neutral or UNLOCK Measure the voltage to ground: There should be about 5 V.
  • Faulty driver's door key cylinder switch
  • A short to ground in the wire
  • Faulty power window master switch
34 BRN Driver's door key cylinder switch in UNLOCK Measure the voltage to ground: There should be less than 0.2 V.
  • Faulty driver's door key cylinder switch
  • Poor ground (G401) or an open in the ground wire
  • An open or high resistance in the wire
Driver's door key cylinder switch in neutral or LOCK Measure the voltage to ground: There should be about 5 V.
  • Faulty driver's door key cylinder switch
  • An open or high resistance in the wire
  • Faulty power window master switch
33 YEL Driver's door lock knob switch in LOCK Measure the voltage to ground: There should be less than 0.2 V.
  • Faulty driver's door lock knob switch
  • Poor ground (G401) or an open in the ground wire
  • An open or high resistance in the wire
Driver's door lock knob switch in UNLOCK Measure the voltage to ground: There should be about 5 V.
  • Faulty driver's door lock knob switch
  • A short to ground in the wire
  • Faulty power window master switch
32 GRN Driver's door lock knob switch in UNLOCK Measure the voltage to ground: There should be less than 0.2 V.
  • Faulty driver's door lock knob switch
  • Poor ground (G401) or an open in the ground wire
  • An open or high resistance in the wire
Driver's door lock knob switch in LOCK Measure the voltage to ground: There should be about 5 V.
  • Faulty driver's door lock knob switch
  • A short to ground in the wire
  • Faulty power window master switch

Front Passenger's Power Window Switch

11. Turn the vehicle to the OFF (LOCK) mode, open and close the driver's door.

12. Disconnect the front passenger's power window switch 37P connector.

Honda Pilot. Parts Test Info

13. 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 14.

14. 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 15.
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
24 GRY Disconnect the power window master switch 37P connector and the moonroof motor-control unit 14P connector Check for continuity between terminal No. 24 and power window master switch 37P connector terminal No. 36: There should be continuity. An open in the LIN (P/W) wire
Check for continuity between terminal No. 24 and moonroof motor-control unit 14P connector terminal No. 12: There should be continuity. An open in the LIN (P/W) wire
Check for continuity to ground: There should be no continuity. A short to ground in the LIN (P/W) wire

15. Reconnect the connector, 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 16.
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
14 GRN Under all conditions Measure the voltage to ground: There should be battery voltage.
  • Blown No. C4 (20 A) fuse in the under-dash fuse/relay box
  • An open or high resistance in the wire
9 BLK In all power modes Measure the voltage to ground: There should be less than 0.2 V.
  • Poor ground (G405)
  • An open or high resistance in the ground wire
11 BLU Front passenger's door lock knob switch in UNLOCK Measure the voltage to ground: There should be less than 0.2 V.
  • Front passenger's door lock knob switch
  • Poor ground (G405) or an open in the ground wire
  • An open or high resistance in the wire
Front passenger's door lock knob switch in LOCK Measure the voltage to ground: There should be about 5 V.
  • Front passenger's door lock knob switch
  • A short to ground in the wire
  • Faulty front passenger's power window switch

16. If multiple failures are found on more than one control unit, replace the under-dash fuse/relay box (includes the MICU). If input failures are related to a particular control unit, replace the control unit.

Honda Pilot 2016-2022 (YF5/YF6) Service Manual

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