Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
(a) Disconnect the MB main body ECU (multiplex network body ECU) connector.
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(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 connectors disconnected.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| MB-11 (GND1) - Body ground | - | Ground | Always | Below 1 Ω |
| MB-31 (BECU) - Body ground | - | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| MB-30 (ACC) - Body ground | - | ACC power supply | Power switch on (IG) | 11 to 14 V |
| Power switch off | Below 1 V | |||
| MB-32 (IG) - Body ground | - | IG power supply | Power switch on (IG) | 11 to 14 V |
| Power switch off | Below 1 V |
(c) Reconnect the MB main body ECU (multiplex network body ECU) connector.
(d) Check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| 3D-25 - Body ground | BE - Body ground | LIN communication line | Power switch on (IG) | Pulse generation |
| 3D-17 - Body ground | L - Body ground | LIN communication line | Power switch on (IG) | Pulse generation |
CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (DRIVER DOOR)
(a) Disconnect the J27 power window regulator motor assembly (driver door) 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 |
|---|---|---|---|---|
| J27-2 (B) - Body ground | GR - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| J27-1 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the J27 power window regulator motor assembly (driver door) connector.
(d) Check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| J27-9 (LIN) - Body ground | G - Body ground | LIN communication line | Power switch on (IG) | Pulse generation |
CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (FRONT PASSENGER DOOR)
(a) Disconnect the J5 power window regulator motor assembly (front passenger door) 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 |
|---|---|---|---|---|
| J5-2 (B) - Body ground | GR - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| J5-1 (E) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the J5 power window regulator motor assembly (front passenger door) connector.
(d) Check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| J5-9 (LIN) - Body ground | P - Body ground | LIN communication line | Power switch on (IG) | Pulse generation |
CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR RH DOOR)
(a) Disconnect the L4 power window regulator motor assembly (rear RH door) 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 |
|---|---|---|---|---|
| L4-2 (B) - Body ground | B - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| L4-1 (E) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the L4 power window regulator motor assembly (rear RH door) connector.
(d) Check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| L4-9 (LIN) - Body ground | P - Body ground | LIN communication line | Power switch on (IG) | Pulse generation |
CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR LH DOOR)
(a) Disconnect the L10 power window regulator motor assembly (rear LH door) 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 |
|---|---|---|---|---|
| L10-2 (B) - Body ground | B - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| L10-1 (E) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the L10 power window regulator motor assembly (rear LH door) connector.
(d) Check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| L10-9 (LIN) - Body ground | P - Body ground | LIN communication line | Power switch on (IG) | Pulse generation |
CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY
(a) Disconnect the J20 multiplex network master switch 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 |
|---|---|---|---|---|
| J20-11 (B) - Body ground | LA-R - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| J20-12 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the J20 multiplex network master switch assembly connector.
(d) Check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| J20-17 (LIN1) - Body ground | P - Body ground | LIN communication line | Power switch on (IG) | Pulse generation |
CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)
(a) Disconnect the P22 sliding roof ECU (sliding roof drive gear sub-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 |
|---|---|---|---|---|
| P22-1 (B) - Body ground | B - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| P22-2 (E) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the P22 sliding roof ECU (sliding roof drive gear sub-assembly) connector.
(d) Check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| P22-7 (MPX1) - Body ground | LA-P - Body ground | LIN communication line | Power switch on (IG) | Pulse generation |
CHECK KICK DOOR CONTROL SENSOR (w/ Power Trunk Lid System)
(a) Disconnect the S5 kick door control sensor connector.
(b) Measure the resistance and voltage according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| S5-1 (B) - Body ground | B - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| S5-4 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the S5 kick door control sensor connector.
(d) Measure the pulse according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| S5-2 (LIN) - Body ground | G - Body ground | LIN communication line | Power switch on (IG) | Pulse generation |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
(a) Disconnect the G47 certification ECU (smart key ECU 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 |
|---|---|---|---|---|
| G47-4 (+B) - Body ground | W - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| G47-18 (E) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the G47 certification ECU (smart key ECU assembly) connector.
(d) Check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| G47-13 (LIN) - Body ground | B - Body ground | LIN communication line | Power switch on (IG) | Pulse generation |
CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)
(a) Disconnect the G51 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| G51-7 (B) - Body ground | G - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| G51-1 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the G51 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(d) Check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| G51-5 (LIN) - Body ground | B - Body ground | LIN communication line | Power switch on (IG) | Pulse generation |
CHECK ID CODE BOX (IMMOBILISER CODE ECU)
(a) Disconnect the G52 ID code box (immobiliser code ECU) 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 |
|---|---|---|---|---|
| G52-5 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| G52-1 (+B) - Body ground | G - Body ground | +B power supply | Power switch off | 11 to 14 V |
(c) Reconnect the G52 ID code box (immobiliser code ECU) connector.
(d) Check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| G52-2 (LIN1) - Body ground | B- Body ground | LIN communication line | Power switch on (IG) | Pulse generation |
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the LIN communication system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
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System Description
SYSTEM DESCRIPTION LIN COMMUNICATION SYSTEM DESCRIPTION The LIN communication system is used for communication between the components in the tables below. If communication cannot be performed through
System Diagram
SYSTEM DIAGRAM DOOR BUS LINES CERTIFICATION BUS LINES
SEE MORE:
Lost Communication with Multi-axis Acceleration Sensor Module Missing Message (U012587,U012987,U014087,U015587,U029387)
DESCRIPTION When a malfunction is detected between various ECUs and sensors, these DTCs are stored. DTC No. Detection Item DTC Detection Condition Trouble Area U012587 Lost Communication with Multi-axis Acceleration Sensor Module Missing Message While the vehicle is being driven at
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.*1
