No Answer-Back (Hazard Warning Light and Wireless Door Lock Buzzer)

DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM: No Answer-Back (Hazard Warning Light and Wireless Door Lock Buzzer)

No Answer-Back (Hazard Warning Light and Wireless Door Lock Buzzer)

DESCRIPTION

If there is no answer-back of the hazard light signal and the wireless door lock buzzer although the wireless control function is operating normally, there might be a malfunction in the hazard light signal and the wireless door lock buzzer signal which are output from the multiplex network body ECU.
NOTE: Troubleshooting should be started after confirming that the answer-back function has been switched ON through customization.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRELESS DOOR LOCK CONTROL SYSTEM
(a) Check whether the wireless door lock functions by operating the transmitter switch Component Tests and General Diagnostics.
HINT: When the wireless door LOCK/UNLOCK operation can be performed, it means that the wireless signal from the transmitter is properly input to the multiplex network body ECU.

Result





A -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and push the Techstream main switch ON.
(c) Select the item "HAZARD" in the ACTIVE TEST and check the turn signal flasher relay ON/OFF.
(d) Select the item "BUZZ RESP SOUND" in the ACTIVE TEST and check the wireless buzzer ON/OFF.

BODY:





Result





C -- REPLACE MULTIPLEX NETWORK BODY ECU
A -- INSPECT WIRELESS DOOR LOCK BUZZER
B -- Continue to next step.
3. CHECK HAZARD WARNING LIGHTS
(a) Check that the hazard warning lights blink when the hazard warning signal switch is pressed.
NG -- GO TO LIGHTING SYSTEM
OK -- REPLACE MULTIPLEX NETWORK BODY ECU
4. INSPECT WIRELESS DOOR LOCK BUZZER





(a) Check the buzzer resistance.
- The buzzer circuit is built into the ECU, not into the buzzer itself.
- When battery voltage is directly applied to the buzzer, the buzzer does not sound.

(1) Check the resistance between terminals of the buzzer.
Standard:






NG -- REPLACE WIRELESS DOOR LOCK BUZZER
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - MULTIPLEX NETWORK BODY ECU)





(a) Disconnect the K1 buzzer connector and B8 ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MULTIPLEX NETWORK BODY ECU