NETWORKING: CXPI COMMUNICATION SYSTEM: TERMINALS OF ECU; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022

TERMINALS OF ECU

NOTICE:

Do not remove or install the power distribution box assembly with the negative (-) auxiliary battery terminal connected.
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
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When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.
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CHECK POWER DISTRIBUTION BOX ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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

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(b) Reconnect the power distribution box assembly connectors.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

MB-13 (GND1) - Body ground

Ground

Always

Below 1 Ω

MB-14 (GND2) - Body ground

Ground

Always

Below 1 Ω

MB-26 (BECU) - Body ground

Auxiliary battery power supply

Always*1

Ignition switch off*2

11 to 14 V

MB-27 (IGR) - Body ground

IG power supply

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

(d) Install the main body ECU (multiplex network body ECU).

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

8F-9 - Body ground

CXPI communication line

Ignition switch ON

Pulse generation

CHECK WINDSHIELD WIPER RELAY ASSEMBLY

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