Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Mirror Heater does not Operate with Rear Defogger Switch

Toyota Tacoma 2015-2018 Service Manual / Mirror / Power Mirror Control System / Mirror Heater does not Operate with Rear Defogger Switch

DESCRIPTION

When the mirror heater switch on the air conditioning control assembly is pressed, the operation signal is sent to the air conditioning amplifier assembly. When the air conditioning amplifier assembly receives the signal, it turns on a relay in the air conditioning amplifier assembly to operate the mirror heaters.

WIRING DIAGRAM

See page ( CAUTION / NOTICE / HINT ).

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

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.

Air Conditioner

Tester Display

Measurement Item

Control Range

Diagnostic Note

Defogger Relay (Rear)

Mirror heater operation

OFF or ON

-

Result

Result

Proceed to

Mirror heater operation on both mirrors is not normal

A

Mirror heater operation on RH side mirror is not normal

B

Mirror heater operation on LH side mirror is not normal

C

B

GO TO STEP 7

C

GO TO STEP 9

A

2.

INSPECT MIR HTR RELAY

(a) Remove the MIR HTR relay from the instrument panel relay block.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - 5

Battery voltage applied to terminals 1 and 2

Below 1 Ω

3 - 5

Battery voltage not applied between terminals

10 kΩ or higher

NG

REPLACE MIR HTR RELAY

OK

3.

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

(a) for Automatic Air Conditioning

(1) Disconnect the A35 air conditioning amplifier assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

MHR HTR relay terminal 1 - A35-9 (MHTR)

Always

Below 1 Ω

MHR HTR relay terminal 1 or A35-9 (MHTR) - Body ground

Always

10 kΩ or higher

(b) for Manual Air Conditioning

(1) Disconnect the A14 air conditioning amplifier assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

MHR HTR relay terminal 1 - A14-17 (MHTR)

Always

Below 1 Ω

MHR HTR relay terminal 1 or A14 -17 (MHTR) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONING CONTROL ASSEMBLY)

(a) for Automatic Air Conditioning

(1) Disconnect the A36 air conditioning amplifier assembly connector.

(2) Disconnect the A33 air conditioning control assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A33-10(E) - A36-5 (RDSW)

Always

Below 1 Ω

A33-10(E) or A36-5 (RDSW) - Body ground

Always

10 kΩ or higher

(b) for Manual Air Conditioning

(1) Disconnect the A14 air conditioning amplifier assembly connector.

(2) Disconnect the A33 air conditioning control assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A33-15(E) - A14-29 (RDSW)

Always

Below 1 Ω

A33-15(E) or A14-29 (RDSW) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

(a) Replace the air conditioning control assembly.

  • for Automatic Air Conditioning (See page )
  • for Manual Air Conditioning (See page )
NEXT

6.

CHECK MIRROR HEATER OPERATION

(a) Check the mirror heater operation.

(See page )

OK

END (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE)

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

7.

CHECK HARNESS AND CONNECTOR (MIR HTR RELAY - OUTER REAR VIEW MIRROR ASSEMBLY RH - BODY GROUND)

(a) Remove the MIR HTR relay from the instrument panel relay block.

(b) Disconnect the O3 outer rear view mirror assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

MIR HTR relay terminal 3 - O3-2 (+)

Always

Below 1 Ω

O3-8 (-) - Body Ground

Always

Below 1 Ω

MIR HTR relay terminal 3 or O3-2 (+) - Body Ground

Always

10 kΩ or higher

Result

Proceed to

OK

NG

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

INSPECT OUTER MIRROR COVER RH (MIRROR HEATER)

(a) Remove the outer mirror RH.

(See page (b) Inspect the outer mirror RH. )

(b) Inspect the outer mirror RH.

(See page OK: )

OK:

Outer mirror RH is normal.

Result

Proceed to

OK

NG

OK

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH

NG

REPLACE OUTER MIRROR RH

9.

CHECK HARNESS AND CONNECTOR (MIR HTR RELAY - OUTER REAR VIEW MIRROR ASSEMBLY LH - BODY GROUND)

(a) Remove the MIR HTR relay from the instrument panel relay block.

(b) Disconnect the O2 outer rear view mirror assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

MIR HTR relay terminal 3 - O2-2 (+)

Always

Below 1 Ω

O2-8 (-) - Body Ground

Always

Below 1 Ω

MIR HTR relay terminal 3 or O2-2 (+) - Body Ground

Always

10 kΩ or higher

Result

Proceed to

OK

NG

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.

INSPECT OUTER MIRROR COVER LH (MIRROR HEATER)

(a) Remove the outer mirror LH.

(See page (b) Inspect the outer mirror LH. )

(b) Inspect the outer mirror LH.

(See page OK: )

OK:

Outer mirror LH is normal.

Result

Proceed to

OK

NG

OK

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH

NG

REPLACE OUTER MIRROR LH

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