Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Air Conditioning Control Panel Circuit
DESCRIPTION
The radio receiver assembly (A/C control panel) switch signals are sent to the air conditioning amplifier assembly via CAN communication.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | CHECK CAN COMMUNICATION SYSTEM |
(a) Using the Techstream, check if the CAN communication system is functioning normally.
Click here .gif)
| Result | Proceed to |
|---|---|
| CAN communication system DTCs are not output | A |
| CAN communication system DTCs are output | B |
| B | .gif) | GO TO CAN COMMUNICATION SYSTEM |
|
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| 2. | CHECK AVC-LAN COMMUNICATION CIRCUIT |
(a) Check for an open or short in all AVC-LAN communication circuits.
w/ Navigation System: Click here
w/ Audio and Visual System (for 12.3 Inch Display): Click here
w/ Audio and Visual System (for 8 Inch Display): Click here
OK:
There is no open or short circuit.
| NG | | REPAIR AVC-LAN COMMUNICATION CIRCUIT |
|
| 3. | CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY (A/C CONTROL PANEL) - POWER SOURCE AND BODY GROUND) |
(a) Disconnect the J148 and J149 radio receiver assembly (A/C control panel) connectors.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J149-19 (IG) - Body ground | Engine switch on (IG) | 11 to 14 V |
| J148-15 (ACC1) - Body ground | Engine switch on (ACC) | 11 to 14 V |
| J148-4 (+B1) - Body ground | Always | 11 to 14 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J148-1 (GND1) - Body ground | Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY ASSEMBLY - POWER SOURCE AND BODY GROUND) |
(a) Disconnect the J56 multi-display assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J56-24 (ACC) - Body ground | Engine switch on (ACC) | 11 to 14 V |
| J56-12 (B) - Body ground | Always | 11 to 14 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J56-13 (GND1) - Body ground | Always | Below 1 Ω |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Lost Communication with ECM (U0100-U0142,U0151,U0155,U0163)
DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area Memory U0100 Lost Communication with ECM No communication with ECM
CAN communication system
ECM
M ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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