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

In some cases, wireless control functions are normal but the hazard warning light and wireless door lock buzzer answer-back functions are not. In such a case, the multiplex network body ECU's hazard warning light and wireless door lock buzzer signal outputs may be malfunctioning.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRELESS DOOR LOCK FUNCTIONS
(a) Check the wireless door lock functions by operating the transmitter switch.

HINT: When the wireless door LOCK/UNLOCK operation can be performed, the transmitter signal is being properly input to the multiplex network body ECU.

Result:





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





(a) Measure the resistance between terminals 1 and 2 of the buzzer.
Standard resistance:
Approximately 1 kOhms

- The buzzer circuit is built into the multiplex network body ECU, not into the buzzer itself.
- When battery voltage is directly applied to the buzzer, the buzzer does not sound.

NG -- REPLACE WIRELESS DOOR LOCK BUZZER
OK -- Continue to next step.
4. CHECK WIRE HARNESS (WIRELESS DOOR LOCK BUZZER - MPX BODY ECU AND BODY GROUND)





(a) Disconnect the K1 buzzer connector.
(b) Disconnect the B9 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (MULTIPLEX NETWORK BODY ECU)