| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM10000000263S9 |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [09/2022 - ] |
| Title: POWER DISTRIBUTION: POWER INTEGRATION SYSTEM: TERMINALS OF ECU; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - ] | ||
TERMINALS OF ECU
NOTICE:
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After turning the ignition switch to 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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![2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION](/t3Portal/stylegraphics/info.gif)
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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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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 main body ECU (multiplex network body ECU) to power distribution box assembly.
(e) Measure the voltage and check for pulses according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
43-8H - Body ground |
B - 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-5 - Body ground |
SB - Body ground*1 L - Body ground*2 |
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 |
|||
|
8D-11 - Body ground |
W - Body ground*1 LA-R - Body ground*2 |
DOME CUT relay output |
Always |
8 to 14 V |
|
8H-24 - Body ground |
R - Body ground*1 P - Body ground*2 |
|||
|
8A-6 - Body ground*3 |
GR - 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 |
|||
|
8M1 - Body ground |
B - Body ground*4 B-R - Body ground*5 |
Tail light output |
Tail light not illuminated |
Below 1.5 V |
|
Tail light illuminated |
8 to 14 V |
|||
|
8H-7 - Body ground*6 |
BE - 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 |
- *1: for G16E-GTS
- *2: except G16E-GTS
- *3: w/ Mirror Heater
- *4: except M20A-FKS
- *5: for M20A-FKS
- *6: w/ Front Fog Light
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