Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Terminals Of Ecu

TERMINALS OF ECU

NOTICE:

  • After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

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  • When disconnecting and reconnecting the auxiliary battery.

    HINT:

    When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

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

(a) Remove the power distribution box assembly and the main body ECU (multiplex network body ECU).

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(b) Connect the power distribution box assembly connectors.

(c) Measure the voltage and resistance according to the value(s) in the table below.

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

Ignition switch off

11 to 14 V

MB-27 (IGR) - Body ground

Ignition power supply (IG signal)

Ignition switch ON

11 to 14 V

(d) Install the power distribution box assembly and the main body ECU (multiplex network body ECU).

(e) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

8E-5 - Body ground

CXPI communication line

Ignition switch off

Below 1 V

Ignition switch ON

Pulse generation

8F-43 - Body ground

Rear window defogger signal (output)

Rear window defogger switch off

Below 1.5 V

Rear window defogger switch on

8 to 14 V

8F-38 - Body ground

Back-up light output

Ignition switch ON, shift position is not R

Below 1.5 V

Ignition switch ON, shift position is R

8 to 14 V

8C-4 - Body ground

DOME CUT relay output

Ignition switch off

8 to 14 V

8F-20 - Body ground

8B-2 - Body ground

Mirror heater drive voltage (output)

Rear window defogger switch off

Below 1.5 V

Rear window defogger switch on

8 to 14 V

8F-30 - Body ground

Tail light output

Tail light not illuminated

Below 1.5 V

Tail light illuminated

8 to 14 V

8F-25 - Body ground

Front fog light output

Tail light illuminated, front fog light switch off

8 to 14 V

Tail light illuminated, front fog light switch on

Below 1.5 V

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