Unlock Warning Switch Circuit

DOOR LOCK: KEY REMINDER WARNING SYSTEM: Unlock Warning Switch Circuit

Unlock Warning Switch Circuit

DESCRIPTION

The unlock warning switch detects if the key is in the ignition key cylinder.
The unlock warning switch turns on when the key is inserted into the ignition key cylinder and turns off when the key is removed from the cylinder.
The body ECU is connected to the unlock warning switch via terminal KSW and key detection status signals are input to the ECU.
The body ECU applies voltage to the unlock warning switch via terminal KSW. When the unlock warning switch is on (there is continuity between the switch terminals), a signal indicating that the key is in the ignition key cylinder is input to the body ECU. When the switch is off (there is no continuity between the switch terminals), a signal indicating that the key is not in the cylinder is input.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE OF DATA LIST (UNLOCK WARNING SWITCH)
(a) Check the Data List to ensure proper function of the door unlock detection switch.

Main Body:





OK:
The display is as specified in the normal condition.
NG -- INSPECT UNLOCK WARNING SWITCH ASSEMBLY
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. INSPECT UNLOCK WARNING SWITCH ASSEMBLY





(a) Remove the unlock warning switch assembly.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE UNLOCK WARNING SWITCH ASSEMBLY
OK -- Continue to next step.
3. CHECK WIRE HARNESS (UNLOCK WARNING SWITCH - INSTRUMENT PANEL J/B (BODY ECU))





(a) Disconnect the unlock warning switch assembly connector.
(b) Disconnect the instrument panel J/B connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE