Toyota CH-R Service Manual: Rear Window Defogger System does not Operate

Toyota CH-R Service Manual / Window / Glass / Window Defogger System / Rear Window Defogger System does not Operate

DESCRIPTION

When the rear window defogger 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 DEF relay to operate the window defogger system.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • If the battery voltage becomes low, window defogger system operation is canceled to prioritize supplying power to the power steering system.

    Click here

PROCEDURE

1.

CHECK AIR CONDITIONING SYSTEM

(a) Check the air conditioning system.

HINT:

Both the window defogger 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

B

GO TO AIR CONDITIONING SYSTEM

C

GO TO AIR CONDITIONING SYSTEM

A

2.

PERFORM ACTIVE TEST USING TECHSTREAM

(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 / Air Conditioner / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Defogger Relay (Rear)

Rear window defogger wire

OFF or ON

-

Body Electrical > Air Conditioner > Active Test

Tester Display

Defogger Relay (Rear)

OK:

The window defogger system operates normally.

NG

GO TO STEP 4

OK

3.

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

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

Click here

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

Click here

OK:

The window defogger system operates normally.

OK

END (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE)

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

4.

INSPECT DEF RELAY

(a) Remove the DEF relay from the No. 1 engine room relay block.

(b) Inspect the DEF relay.

Click here

NG

REPLACE DEF RELAY

OK

5.

CHECK HARNESS AND CONNECTOR (DEF RELAY - POWER SOURCE)

(a) Remove the DEF relay from the No. 1 engine room relay block.

*1

No. 1 Engine Room Relay Block

*a

DEF Relay Holder

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

DEF relay holder terminal 1 - Body ground

Ignition switch to ON

11 to 14 V

DEF relay holder terminal 5 - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK HARNESS AND CONNECTOR (DEF RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

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

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

*1

No. 1 Engine Room Relay Block

*a

DEF Relay Holder

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

Standard Resistance:

for TMMT Made

Tester Connection

Switch Condition

Specified Condition

DEF relay holder terminal 2 - F72-26 (RDFG)

Always

Below 1 Ω

DEF relay holder terminal 2 or F72-26 (RDFG) - Body ground

Always

10 kΩ or higher

for TMC Made

Tester Connection

Switch Condition

Specified Condition

DEF relay holder terminal 2 - F139-5 (RDFG)

Always

Below 1 Ω

DEF relay holder terminal 2 - F139-5 (RDFG)

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) for TMMT Made

(1) Reconnect the F72 air conditioning amplifier assembly connector.

(2) Reinstall the DEF relay.

(3) Remove the air conditioning amplifier assembly with its connectors still connected.

Click here

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F72-26 (RDFG) - F72-29 (GND)

Ignition switch ON, rear window defogger switch on

Below 1 V

F72-26 (RDFG) - F72-29 (GND)

Ignition switch ON, rear window defogger switch off

11 to 14 V

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

(b) for TMC Made

(1) Reconnect the F139 air conditioning amplifier assembly connector.

(2) Reinstall the DEF relay.

(3) Remove the air conditioning amplifier assembly with its connectors still connected.

Click here

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F139-5 (RDFG) - F139-4 (GND)

Ignition switch ON, rear window defogger switch on

Below 1 V

F139-5 (RDFG) - F139-4 (GND)

Ignition switch ON, rear window defogger switch off

11 to 14 V

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

OK

8.

CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE) - DEF RELAY AND BODY GROUND)

(a) Disconnect the S13 and S14 back door glass (rear window defogger wire) connectors.

*1

NO. 1 Engine Room Relay Block

*a

DEF Relay Holder

(b) Remove the DEF relay from the No. 1 engine room relay block.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

S13-1 - DEF relay holder terminal 3

Always

Below 1 Ω

S14-1 - Body ground

Always

Below 1 Ω

S13-1 - Body ground

Always

10 kΩ or higher

OK

REPLACE BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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