Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM100000000Z8HW |
Model Year Start: 2017 |
Model: Sienna |
Prod Date Range: [08/2016 -
] |
Title: NETWORKING: LIN COMMUNICATION SYSTEM: LIN Communication Circuit; 2017 - 2020 MY Sienna [08/2016 - ] |
LIN Communication Circuit
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DESCRIPTION
When a switch of the air conditioning control assembly or air conditioning control assembly No. 2 are operated, the air conditioning control assembly or air conditioning control assembly No. 2 uses LIN communication to communicate with air conditioning amplifier assembly. If a switch of the air conditioning control assembly or air conditioning control assembly No. 2 does not operate properly, a problem with the LIN communication between the air conditioning control assembly or air conditioning control assembly No. 2 and air conditioning control amplifier may be causing the malfunction.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
PROCEDURE
1.
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CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY (A/C ECU) - EACH ECU)
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*a
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Front view of wire harness connector
(to Air Conditioning Amplifier Assembly (A/C ECU))
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*b
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Front view of wire harness connector
(to Air Conditioning Control Assembly)
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*c
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Front view of wire harness connector
(to Air Conditioning Control Assembly No. 2)
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-
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-
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(a) Disconnect the D75 and D186 air conditioning amplifier assembly (A/C ECU) connectors.
(b) Disconnect the D69 air conditioning control assembly connector.
(c) Disconnect the T7 air conditioning control assembly No. 2 connector.
(d) Measure the resistance and voltage according to the value(s) in the tables below.
Standard Resistance (Check for Open):
Tester Connection
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Condition
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Specified Condition
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D75-37 (LIN1) - D69-8 (LIN1)
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Always
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Below 1 Ω
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D186-16 (RLIN) - T7-2 (RLIN)
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Always
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Below 1 Ω
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Standard Resistance (Check for Short):
Tester Connection
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Condition
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Specified Condition
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D75-37 (LIN1) - Body ground
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Always
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10 kΩ or higher
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D186-16 (RLIN) - Body ground
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Always
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10 kΩ or higher
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Standard Voltage:
Tester Connection
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Condition
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Specified Condition
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D75-37 (LIN1) - Body ground
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Always
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Below 1 V
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D186-16 (RLIN) - Body ground
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Always
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Below 1 V
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NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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OK
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|
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2.
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CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY NO. 2 - BATTERY AND BODY GROUND)
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(a) Disconnect the air conditioning control assembly No. 2 connector.
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*a
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Front view of wire harness connector
(to Air Conditioning Control Assembly No. 2)
|
|
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(b) Measure the resistance and voltage according to the value(s) in the tables below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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T7-4 (E) - Body ground
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Always
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Below 1 Ω
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Standard Voltage:
Tester Connection
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Switch Condition
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Specified Condition
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T7-1 (IG) - Body ground
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Ignition switch ON
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11 to 14 V
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NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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OK
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|
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3.
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REPLACE AIR CONDITIONING CONTROL ASSEMBLY NO.2
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(a) Temporarily replace the air conditioning control assembly No. 2 with a new or normally functioning one (See page
).
(b) Check that the air conditioning control assembly No. 2 function is normal.
OK:
Air conditioning control assembly No. 2 function is normal.
OK |
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END (NO. 2 AIR CONDITIONING CONTROL ASSEMBLY IS MALFUNCTIONING)
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NG
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|
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4.
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CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BATTERY AND BODY GROUND)
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(a) Disconnect the air conditioning control assembly connector.
|
|
*a
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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
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Condition
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Specified Condition
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D69-5 (GND) - Body ground
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Always
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Below 1 Ω
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Standard Voltage:
Tester Connection
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Switch Condition
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Specified Condition
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D69-4 (IG+) - Body ground
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Ignition switch ON
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11 to 14 V
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NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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OK
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|
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5.
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REPLACE AIR CONDITIONING CONTROL ASSEMBLY
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(a) Temporarily replace the air conditioning control assembly with a new or normally functioning one (See page
).
(b) Check that the front air conditioning control assembly function is normal.
OK:
Front air conditioning control assembly function is normal.
OK |
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END (AIR CONDITIONING CONTROL ASSEMBLY IS MALFUNCTIONING)
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