Toyota CH-R Service Manual: Unlock Warning Switch Circuit

Toyota CH-R Service Manual / Theft Deterrent / Keyless Entry / Theft Deterrent System / Unlock Warning Switch Circuit

DESCRIPTION

The key unlock warning switch assembly comes on when the ignition key is inserted into the ignition key cylinder and goes off when the ignition key is removed.

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING TECHSTREAM (KEY UNLOCK WARNING SW)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) According to the display on the Techstream, read the Data List.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Key Unlock Warning SW

Unlock warning switch

ON or OFF

ON: Key is inserted into ignition key cylinder

OFF: Key is removed from ignition key cylinder

-
Body Electrical > Main Body > Data List

Tester Display

Key Unlock Warning SW

OK:

When the key is in the ignition key cylinder, "ON" appears on the screen.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT UNLOCK WARNING SWITCH ASSEMBLY

(a) Remove the unlock warning switch assembly.

Click here

(b) Inspect the unlock warning switch assembly.

Click here

NG

REPLACE UNLOCK WARNING SWITCH ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - UNLOCK WARNING SWITCH ASSEMBLY - BODY GROUND)

(a) Disconnect the 3A instrument panel junction block assembly connector.

(b) Disconnect the F13 unlock warning switch assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

3A-41 - F13-1 (UN+)

Always

Below 1 Ω

3A-41 or F13-1 (UN+) - Body ground

Always

10 kΩ or higher

F13-2 (UN-) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the main body ECU (multiplex network body ECU).

Click here

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

-

-

(b) Disconnect the 3A instrument panel junction block assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

3A-41 - MB-3 (KSW)

Always

Below 1 Ω
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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