| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Vehicle Interior | Section: Heating/Air Conditioning | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000003F05000X |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DESCRIPTION (2008 Sequoia) | ||
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Rear Air Conditioning Control Panel Circuit |
DESCRIPTION
This circuit consists of the air conditioning control and the air conditioning amplifier. When the air conditioning control is operated, signals are transmitted to the air conditioning amplifier through the LIN communication system
If the LIN communication system malfunctions, the air conditioning amplifier does not operate even if the air conditioning control is operated.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
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1. |
INSPECT FUSE (LH-IG) |
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(a) Remove the LH-IG fuse from the main body ECU. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
LH-IG fuse |
Always |
Below 1 Ω |
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2. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL - FUSE, BODY GROUND) |
(a) Disconnect the S4 air conditioning control connector.
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(b) Measure the resistance and voltage according to the value(s) in the table below. Standard Resistance:
Standard Voltage:
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(c) Reconnect the air conditioning control connector.
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3. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL - AIR CONDITIONING AMPLIFIER) |
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(a) Disconnect the S4 air conditioning control connector. |
(b) Disconnect the H67 air conditioning amplifier connector.
(c) Measure the resistance and voltage according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H67-13 (RLIN) - S4-5 (RLIN) |
Always |
Below 1 Ω |
|
S4-5 (RLIN) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the air conditioning amplifier connector.
(e) Reconnect the air conditioning control connector.
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4. |
REPLACE AIR CONDITIONING CONTROL |
(a) Replace the air conditioning control with a new or properly functioning one
.
(b) Operate the rear power seat module to check that it functions properly.
OK:
Rear air conditioning control panel function operates normally.
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