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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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
J127-4 (IG+) - Body ground	Ignition switch OFF	Below 1 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE)

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

How To Proceed With Troubleshooting

Parts Location

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