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Home >> Honda >> 2021 >> Pilot Elite >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Security System Keyless Entry System - Testing & Troubleshooting (1 Of 2) >> Input Test >> Keyless/Power Door Locks/Security System (MICU, Door Multiplex Control Unit, And Front Passenger's Power Window Switch)
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Keyless/Power Door Locks/Security System (MICU, Door Multiplex Control Unit, And Front Passenger's Power Window Switch)

NOTE: 

MICU 

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

2. Disconnect under-dash fuse/relay box connectors.

Under-dash fuse/relay box connector D (44P) (female terminals): (1)

Under-dash fuse/relay box connector E (38P) (female terminals): (2)

Under-dash fuse/relay box connector F (18P) (female terminals): (3)

Under-dash fuse/relay box connector M (12P) (female terminals): (4)

Under-dash fuse/relay box connector P (24P) (female terminals): (5)

Under-dash fuse/relay box connector S (18P) (female terminals): (6)

Under-dash fuse/relay box connector T (10P) (female terminals): (7)

GHH312241Courtesy of HONDA, U.S.A., INC.

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

4. With the connectors still disconnected, do the following input tests:

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 terminal T6 (or T5), and terminal T5 (or T6) to 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 terminal S2 (or S5), and terminal S5 (or S2) to 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 terminal D11 (or D12), and terminal D12 (or D11) to 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.
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:

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.
E32*4 BRN Vehicle ON mode Measure the voltage to ground:
 
There should be battery voltage.
F2 WHT Under all conditions Measure the voltage to ground:
 
There should be battery voltage.
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 battery voltage.
  • 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 battery voltage.
  • 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 battery voltage.
  • 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 battery voltage.
  • 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 battery voltage.
  • 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 battery voltage.
  • 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 battery voltage.
  • 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 battery voltage.
  • 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 battery voltage.
  • 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 battery voltage.
  • 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.

Power Window Master Switch 37P Connector (female terminals) 

GHH312242Courtesy of HONDA, U.S.A., INC.

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

9. With the connector still disconnected, do the following input tests:

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:

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.
26 WHT Under all conditions Measure the voltage to ground:
 
There should be battery voltage.
4 WHT Under all conditions Measure the voltage to ground:
 
There should be battery voltage.
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.

Front Passenger's Power Window Switch 24P Connector (female terminals) 

GHH312243Courtesy of HONDA, U.S.A., INC.

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

14. With the connector still disconnected, do the following input tests:

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:

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.
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 - Removal and Installation . If input failures are related to a particular control unit, replace the control unit.

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