Keyless Access System Touch Sensor Circuit Troubleshooting

ElectronicCircuitSchematics-buttonSystemDescription-buttonKeyless Access System Description - Overview - Refer to: Keyless Access System Description - Components  or Keyless Access System Description - Control/Function  or Keyless Access System Description - System Diagram  or Keyless Access System Description - Overview  or Keyless Access System Description - Failsafe Function  Keyless Access System Description - System Diagram - Refer to: Keyless Access System Description - Components  or Keyless Access System Description - Control/Function  or Keyless Access System Description - System Diagram  or Keyless Access System Description - Overview  or Keyless Access System Description - Failsafe Function  Keyless Access System Description - Control/Function - Refer to: Keyless Access System Description - Components  or Keyless Access System Description - Control/Function  or Keyless Access System Description - System Diagram  or Keyless Access System Description - Overview  or Keyless Access System Description - Failsafe Function  Keyless Access System Description - Components - Refer to: Keyless Access System Description - Components  or Keyless Access System Description - Control/Function  or Keyless Access System Description - System Diagram  or Keyless Access System Description - Overview  or Keyless Access System Description - Failsafe Function  Keyless Access System Description - Failsafe Function - Refer to: Keyless Access System Description - Components  or Keyless Access System Description - Control/Function  or Keyless Access System Description - System Diagram  or Keyless Access System Description - Overview  or Keyless Access System Description - Failsafe Function 

Touch Sensor Circuit Troubleshooting 

1. Keyless access system check

   -1. Select KEYLESS ACCESS CONTROL UNIT from the ONE-PUSH START system select menu with the HDS, and enter HISTORY DATA.

   One-Push - KEYLESS ACCESS CONTROL UNIT- HISTORY DATA

   Select HISTORY CLEAR, and back to TEST MODE menu:

   NOTE: When the freeze data is cleared, the information indicates "NOT CONFIRMED".
   • DRIVER DOOR UNLOCK SWITCH
   • DRIVER DOOR LOCK SWITCH
   • FRONT PASSENGER DOOR UNLOCK SWITCH
   • FRONT PASSENGER DOOR LOCK SWITCH

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Get out of the vehicle with the keyless remote, and touch the each door outer handle touch sensor and push the lock button.

   -5. Select KEYLESS ACCESS CONTROL UNIT from the ONE-PUSH START system select menu with the HDS, and enter HISTORY DATA.

   One-Push - KEYLESS ACCESS CONTROL UNIT- HISTORY DATA

   Recheck HISTORY DATA.

   • DRIVER DOOR UNLOCK SWITCH
   • DRIVER DOOR LOCK SWITCH
   • FRONT PASSENGER DOOR UNLOCK SWITCH
   • FRONT PASSENGER DOOR LOCK SWITCH

   Is all the information OK?

   YES 

   Intermittent failure, the system is OK at this time.

   NO 

   Go to step 2.

2. Open wire check (GND line)

   -1. Disconnect the following connectors.

   Each door outer handle 8P connectors

   -2. Check for continuity between test points 1 and 2.

   Driver's door 

   Test condition	Vehicle OFF (LOCK) modeDriver's door outer handle 8P connector: disconnected
   Test point 1	Driver's door outer handle 8P connector No. 8
   Test point 2	Body ground

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

   Front passenger's door 

   Test condition	Vehicle OFF (LOCK) modeFront passenger's door outer handle 8P connector: disconnected
   Test point 1	Front passenger's door outer handle 8P connector No. 8
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   The GND/GND wires are OK. Go to step 3.

   NO 

   Repair an open or high resistance in the ground wire or poor ground (G401, G405).

3. Determine possible failure area (TS line, VOUT line)

   -1. Measure the voltage between test points 1 and 2.

   Driver's door 

   Test condition	Vehicle OFF (LOCK) modeDriver's door outer handle 8P connector: disconnected
   Test point 1	Driver's door outer handle 8P connector No. 4
   Test point 2	Body ground

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

   Front passenger's door 

   Test condition	Vehicle OFF (LOCK) modeFront passenger's door outer handle 8P connector: disconnected
   Test point 1	Front passenger's door outer handle 8P connector No. 4
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   Go to step 4.

   NO 

   Go to step 7.

4. Open wire check (TS FR DR and TS FR AS lines)

   -1. Disconnect the following connector.

   Keyless access/TPMS control unit connector C (20P)

   -2. Connect terminals A and B with jumper wires.

   Driver's door 

   Terminal A

   Driver's door outer handle 8P connector No. 3

   Terminal B

   Body ground

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

   Front passenger's door 

   Terminal A	Front passenger's door outer handle 8P connector No. 3
   Terminal B	Body ground

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

   -3. Check for continuity between test points 1 and 2 individually.

   Test condition	Vehicle OFF (LOCK) modeEach door outer handle 8P connectors: disconnectedEach door outer handle 8P connectors: jumped to body groundKeyless access/TPMS control unit connector C (20P): disconnected
   Test point 1	Keyless access/TPMS control unit connector C (20P) No. 15 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2022 2023)  or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs
   Test point 2	Body ground

   Test point 1	Keyless access/TPMS control unit connector C (20P) No. 17 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2022 2023)  or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs
   Test point 2	Body ground

   Is there continuity?

   YES 

   The TS FR DR and TS FR AS wires are not open. Go to step 5.

   NO 

   Repair an open or high resistance in the wire.

5. Shorted wire check (TS FR DR and TS FR AS lines)

   -1. Remove the jumper wires from the door outer handle connectors.

   -2. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) modeEach door outer handle 8P connectors: disconnectedKeyless access/TPMS control unit connector C (20P): disconnected
   Test point 1	Keyless access/TPMS control unit connector C (20P) No. 15 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2022 2023)  or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs
   Test point 2	Body ground

   Test point 1	Keyless access/TPMS control unit connector C (20P) No. 17 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2022 2023)  or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the wire.

   NO 

   The TS FR DR and TS FR AS wires are OK. Go to step 6.

6. Door outer handle touch sensor check (substitution)

   -1. Substitute a known-good door outer handle touch sensor, and recheck.

   Is the system OK?

   YES 

   Faulty the original door outer handle touch sensor; replace the door outer handle .

   NO 

   Replace the keyless access/TPMS control unit .

7. Open wire check (VOUT FR DR and VOUT FR AS lines)

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) modeEach door outer handle 8P connectors: disconnected
   Test point 1	Keyless access/TPMS control unit connector A (32P) No. 19 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2022 2023)  or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs
   Test point 2	Body ground

   Test point 1	Keyless access/TPMS control unit connector A (32P) No. 21 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2022 2023)  or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   Repair an open or high resistance in the wire.

   NO 

   The VOUT FR DR and VOUT FR AS wires are OK. Replace the keyless access/TPMS control unit .