Toyota CH-R Service Manual: Windshield Deicer does not Operate

Toyota CH-R Service Manual / Window / Glass / Windshield Deicer System / Windshield Deicer does not Operate

DESCRIPTION

When the windshield deicer switch on the air conditioning control assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly. via LIN communication. When the air conditioning amplifier assembly receives the signal, it turns on the DEICER relay to operate the windshield deicer system.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses and relay for circuits related to this system before performing the following procedure.
If the battery voltage becomes low, windshield deicer operation is canceled to prioritize supplying power to the power steering system.

PROCEDURE

1.	CHECK AIR CONDITIONING SYSTEM

(a) Check air conditioning system.

HINT:

Both the windshield deicer system operation signal and air conditioning system operation signal are transmitted to the air conditioning amplifier assembly via the same communication line.

OK:

The air conditioning system operates normally.

Result	Proceed to
OK	A
NG (for TMMT Made)	B
NG (for TMC Made)	C

GO TO AIR CONDITIONING SYSTEM

2.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Using the Techstream, perform the Active Test.

Click here

Body Electrical > Air Conditioner > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Deicer Relay (Front)	Windshield glass (windshield deicer)	OFF or ON	-

Body Electrical > Air Conditioner > Active Test

Tester Display
Deicer Relay (Front)

OK:

The windshield deicer system operates normally.

GO TO STEP 4

3.	REPLACE AIR CONDITIONING CONTROL ASSEMBLY

(a) Replace air conditioning control assembly with a new or known good one.

Click here

(b) Check that the window defogger system operates normally.

Click here

END (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE)

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY)

(a) Disconnect the 3F and 3A instrument panel junction block assembly connectors.

*a	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
3F-5 - Body ground	Always	11 to 14 V
3A-21 - Body ground	Ignition switch ON	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

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

(b) Disconnect the F72*1 or F139*2 air conditioning amplifier assembly connector.

*1: for TMMT Made
*2: for TMC Made

Standard Resistance:

for TMMT Made

Tester Connection	Condition	Specified Condition
3A-18 - F72-24 (FDEF)	Always	Below 1 Ω
3A-18 or F72-24 (FDEF) - Body ground	Always	10 kΩ or higher

for TMC Made

Tester Connection	Condition	Specified Condition
3A-18 - F139-17 (FDEF)	Always	Below 1 Ω
3A-18 or F139-17 (FDEF) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly

Click here

Component without harness connected (Instrument Panel Junction Block Assembly)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3F-5 - 3F-4	Battery voltage applied between terminals 3A-21 and 3A-18	Below 1 Ω
3F-5 - 3F-4	Battery voltage not applied between terminals 3A-21 and 3A-18	10 kΩ or higher

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

7.	CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY -WINDSHIELD GLASS (WINDSHIELD DEICER))

(a) Disconnect the A64 windshield glass (windshield deicer) connector.

(b) Disconnect the 3F instrument panel junction block.

Standard resistance:

Tester Connection	Condition	Specified Condition
3F-4 - A64-1 (B)	Always	Below 1 Ω
3F-4 or A64-1 (B) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS [WINDSHIELD DEICER] - BODY GROUND)

(a) Disconnect the windshield glass (windshield deicer) connector.

*a	Front view of wire harness connector (to Windshield Glass [Windshield Deicer])

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A64-2 (E) - Body ground	Always	Below 1 Ω

REPLACE WINDSHIELD GLASS (WINDSHIELD DEICER)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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