Toyota Tundra Service Manual: Integration Control and Panel Assembly Communication Error

Toyota Tundra Service Manual / Power Source, Network / Multiplex Communication / Lin Communication System / Integration Control and Panel Assembly Communication Error

DESCRIPTION

The LIN communication of the components related to the mirror heater occurs between the air conditioning amplifier assembly and air conditioning control assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When using the Techstream with the ignition switch OFF to troubleshoot:

Connect the Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the tester and vehicle begins.

PROCEDURE

1.

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

(a) Disconnect the J127 air conditioning control assembly connector.

(b) Disconnect the J19 air conditioning amplifier assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J19-37 (LIN1) - J127-7 (STX)

Always

Below 1 Ω

J19-37 (LIN1) or J127-7 (STX) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BATTERY AND BODY GROUND)

(a) Disconnect the J127 air conditioning control assembly connector.

*a

Front view of wire harness connector

(to Air Conditioning Control Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J127-5 (GND) - Body ground

Always

Below 1 Ω

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

J127-4 (IG+) - Body ground

Ignition switch ON

11 to 14 V

Ignition switch OFF

Below 1 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK AIR CONDITIONING CONTROL ASSEMBLY (OPERATION)

(a) Temporarily replace the air conditioning control assembly with a new or normally functioning one (See page ).

(b) Check that the malfunction disappears.

OK:

Malfunction disappears.

OK

END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE)
NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    How To Proceed With Troubleshooting

    Parts Location

    See More:

    Toyota Tundra Service Manual > Air Conditioning System(for Manual Air Conditioning System): System Description
    SYSTEM DESCRIPTION 1. GENERAL (a) The air conditioning system has the following controls: Control Outline Manual Control The air conditioning amplifier controls the damper positions (air inlet control damper, air mix control damper and mode control damper) and blower speed in accordance with the pos ...

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