Toyota Sienna Service Manual: 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
1 READ VALUE OF DATA LIST (UNLOCK WARNING SWITCH)
- Check the DATA LIST to ensure proper function of the door unlock detection switch.
BODY:
OK: The display is as specified in the normal condition.
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2 INSPECT UNLOCK WARNING SWITCH ASSEMBLY
- Remove the unlock warning switch assembly.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
3 CHECK WIRE HARNESS (UNLOCK WARNING SWITCH - DRIVER SIDE J/B)
- Disconnect the K4 unlock warning switch assembly connector.
- Disconnect the B6 driver side J/B connector.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
Data list / active test
1. READ DATA LIST
HINT:
Using the intelligent tester's DATA LIST allows switch,
actuator and other item values to be read without
removing any parts. Reading the DATA LIST early in
troubleshootin ...
Transmitter battery
REPLACEMENT
1. REMOVE TRANSMITTER BATTERY
NOTICE:
Special caution should be taken for handling each
component as they are precision electronic
components.
Using a coin or the equiva ...
Other materials:
Brake fluid
Bleeding
HINT:
If any work is performed on the brake system or if air in the
brake lines is suspected, bleed the air out of the brake
system.
NOTICE:
Wash the brake fluid off immediately if it adheres to any
painted surfaces.
1. REMOVE COWL TOP PANEL SUB-ASSEMBLY
OUTER FRONT (See page SP-13 ...
Automatic transaxle fluid
On-vehicle inspection
1. CHECK FLUID LEVEL
HINT:
Drive the vehicle so that the engine and transaxle are at
normal operating temperature.
Fluid temperature:
70 to 80°C (158 to 176°F)
(a) Park the vehicle on a level surface and set the
parking brake.
(b) With the engine idling and the ...
Radio and Navigation Assembly Communication Error
INSPECTION PROCEDURE
1 IDENTIFY THE COMPONENT SHOWN BY THE SUB-CODE
Enter the diagnostic mode.
Press the "LAN Mon" switch to change to "LAN Monitor"
mode.
Identify the component shown by the sub-code.
HINT:
"110 (multi-display)" i ...
