Toyota Yaris: Lin Communication System / Terminals Of Ecu

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Power Source & Network / Networking / Lin Communication System / Terminals Of Ecu

TERMINALS OF ECU

CHECK POWER DISTRIBUTION BOX ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

*1

POWER DISTRIBUTION BOX ASSEMBLY

*2

MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Remove main body ECU (multiplex network body ECU).

Click here

(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)

Terminal Description

Switch Condition

Specified Condition

MB-13 (GND1) - Body ground

Ground

Always

Below 1 Ω

MB-26 (BECU) - Body ground

Auxiliary battery power supply

Ignition switch off

11 to 14 V

MB-27 (IGR) - Body ground

IGR power supply

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

(c) Install main body ECU (multiplex network body ECU) connector.

Click here

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Switch Condition

Specified Condition

4E-17 - Body ground

LIN communication line

Ignition switch ON

Pulse generation

CHECK FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY (DRIVER DOOR)

(a) Disconnect the L7 front 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)

Terminal Description

Switch Condition

Specified Condition

L7-2 (B) - Body ground

Auxiliary battery power supply

Ignition switch off

11 to 14 V

L7-1 (GND) - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the L7 front power window regulator motor assembly (driver door) connector.

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Switch Condition

Specified Condition

L7-9 (LIN) - Body ground

LIN communication line

Ignition switch ON

Pulse generation

CHECK FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY (FRONT PASSENGER DOOR)

(a) Disconnect the K7 front 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)

Terminal Description

Switch Condition

Specified Condition

K7-2 (B) - Body ground

Auxiliary battery power supply

Ignition switch off

11 to 14 V

K7-1 (GND) - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the K7 front 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)

Terminal Description

Switch Condition

Specified Condition

K7-9 (LIN) - Body ground

LIN communication line

Ignition switch ON

Pulse generation

CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Disconnect the L13 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)

Terminal Description

Switch Condition

Specified Condition

L13-11 (B) - Body ground

Auxiliary battery power supply

Ignition switch off

11 to 14 V

L13-12 (GND) - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the L13 multiplex network master switch assembly connector.

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Switch Condition

Specified Condition

L13-17 (LIN1) - Body ground

LIN communication line

Ignition switch ON

Pulse generation

L13-16 (LIN2) - Body ground

LIN communication line

Ignition switch ON

Pulse generation

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the H46 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)

Terminal Description

Switch Condition

Specified Condition

H46-6 (+B) - Body ground

Auxiliary battery power supply

Ignition switch off

11 to 14 V

H46-29 (E) - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the H46 certification ECU (smart key ECU assembly) connector.

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Switch Condition

Specified Condition

H46-8 (LIN) - Body ground

LIN communication line

Ignition switch ON

Pulse generation

CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

(a) Disconnect the H71 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)

Terminal Description

Switch Condition

Specified Condition

H71-7 (B) - Body ground

Auxiliary battery power supply

Ignition switch off

11 to 14 V

H71-1 (GND) - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the H71 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)

Terminal Description

Switch Condition

Specified Condition

H71-5 (LIN) - Body ground

LIN communication line

Ignition switch ON

Pulse generation

CHECK ID CODE BOX (IMMOBILISER CODE ECU)

(a) Disconnect the H67 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)

Terminal Description

Switch Condition

Specified Condition

H67-1 (+B) - Body ground

Auxiliary battery power supply

Ignition switch off

11 to 14 V

H67-5 (GND) - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the H67 ID code box (immobiliser code ECU) connector.

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Switch Condition

Specified Condition

H67-2 (LIN1) - Body ground

LIN communication line

Ignition switch ON

Pulse generation

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    Diagnosis System

    DIAGNOSIS SYSTEM DESCRIPTION The main body ECU (multiplex network body ECU) and certification ECU (smart key ECU assembly) control the LIN communication system...

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