Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Terminals Of Ecu
TERMINALS OF ECU
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
(a) Disconnect the J43 air conditioning amplifier assembly connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| J43-2 (IG+) - Body ground | GR - Body ground | IG power supply | Engine switch on (IG) | 11 to 14 V |
| J43-2 (IG+) - Body ground | GR - Body ground | IG power supply | Engine switch off | Below 1 V |
| J43-4 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| J48-1 (GND2) - Body ground* | W-B - Body ground | Ground | Always | Below 1 Ω |
- *: w/ Rear No. 2 Seat
(c) Reconnect the J43 air conditioning amplifier assembly connector.
(d) Measure the voltage and check for pulse generation according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| J48-16 (SHP+) - J43-4 (GND) | Y - W-B | Refreshing seat switch volume signal |
| Below 1 V |
| J48-15 (SHD+) - J43-4 (GND) | P - W-B | Refreshing seat switch volume signal |
| Below 1 V |
| J43-14 (LIN1) - Body ground | G - Body ground | Refreshing seat switch signal | Engine switch on (IG) | Pulse generation |
CHECK REFRESHING SEAT SWITCH (FOR FRONT SIDE)
(a) Disconnect the J82 refreshing seat switch connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| J82-2 (IG) - Body ground | L - Body ground | IG power supply | Engine switch on (IG) | 11 to 14 V |
| J82-2 (IG) - Body ground | L- Body ground | IG power supply | Engine switch off | Below 1 V |
| J82-7 (E) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the J82 refreshing seat switch connector.
(d) Check for pulse according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| J82-4 (LIN1) - Body ground | G - Body ground | Refreshing seat switch signal | Engine switch on (IG) | Pulse generation |
CHECK REFRESHING SEAT SWITCH (FOR REAR SIDE) (w/ Rear Seat Heater) (w/o Rear No. 2 Seat)
(a) Disconnect the J15 refreshing seat switch connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| J15-1 (IG) - Body ground | LG - Body ground | IG power supply | Engine switch on (IG) | 11 to 14 V |
| J15-1 (IG) - Body ground | LG - Body ground | IG power supply | Engine switch off | Below 1 V |
| J15-5 (E) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the J15 refreshing seat switch connector.
(d) Check for pulse according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| J15-3 (RLIN) - Body ground | R - Body ground | Refreshing seat switch signal | Engine switch on (IG) | Pulse generation |
CHECK REAR SEAT HEATER SWITCH (w/ Rear Seat Heater) (w/ Rear No. 2 Seat)
(a) Disconnect the V4 rear seat heater switch connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| V4-1 (IG) - Body ground | LG - Body ground | IG power supply | Engine switch on (IG) | 11 to 14 V |
| V4-1 (IG) - Body ground | LG - Body ground | IG power supply | Engine switch off | Below 1 V |
| V4-5 (E) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the V4 rear seat heater switch connector.
(d) Check for pulse according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| V4-3 (RLIN) - Body ground | R - Body ground | Rear seat heater switch signal | Engine switch on (IG) | Pulse generation |
Diagnosis System
DIAGNOSIS SYSTEM DESCRIPTION (a) Seat heater system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctio ...
Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Air Conditioner / T ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Air Conditioning System: 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
Memorized U0131 Lost Communication with Electric Power Steering ECU No communication with pow ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Vehicle Stability Control System: Brake System Control Module "A" System Voltage System Voltage Low (C137BA2)
DESCRIPTION If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation. This DTC is stored when the +BS terminal voltage meets one of the DTC detection conditions due to a malfunction in ...
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
0.0142