Toyota Yaris: Cxpi Communication System / 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, there is an automatic learning function that completes learning when the respective system is used.
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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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| *1 | Power Distribution Box Assembly | *2 | Main Body ECU (Multiplex Network Body ECU) |
(b) Reconnect the power distribution box assembly connectors.
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(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-26 (BECU) - Body ground | Auxiliary battery power supply | Ignition switch off | 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) Measure the voltage and check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Terminal Description | Condition | Specified Condition |
|---|---|---|---|
| 4D-5 - Body ground | CXPI communication line | Ignition switch ON | Pulse generation |
| 4E-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 | ||
| 4B-2 - Body ground | Mirror heater drive signal (output) | Rear window defogger switch off | Below 1.5 V |
| Rear window defogger switch on | 8 to 14 V | ||
| 4C-10 - Body ground | Power return mirror motor drive signal (output) | Outer rear view mirror assembly moves to the return position. | Below 1.5 V |
| Outer rear view mirror assembly not move. | 8 to 14 V | ||
| 4C-21 - Body ground | Power retract mirror motor drive signal (output) | Outer rear view mirror assembly moves to the retract position | Below 1.5 V |
| Outer rear view mirror assembly not move | 8 to 14 V |
SEMICONDUCTOR POWER INTEGRATION ECU
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the A85 and A86 semiconductor power integration ECU connectors.
(c) Connect the cable to the negative (-) auxiliary battery terminal.
(d) Measure the resistance and voltage according to the value(s) in the table below.
| Terminal No. (Symbol) | Terminal Description | Condition | Specified Condition |
|---|---|---|---|
| A85-1 (+B) - Body ground | Auxiliary battery power supply | Ignition switch off | 8 to 14 V |
| A86-5 (-S) - Body ground | Light control LED ECU RH operation signal input | Headlight not illuminated | 6 V or higher |
| Headlight illuminated | Below 1.7 V | ||
| A86-16 (GND2) - Body ground | Ground | Always | Below 1 Ω |
| A86-20 (IG) - Body ground | IG power supply | Ignition switch off | Below 1.5 V |
| Ignition switch ON | 8 to 14 V | ||
| A86-24 (-S) - Body ground | Light control LED ECU LH operation signal input | Headlight not illuminated | 6 V or higher |
| Headlight illuminated | Below 1.7 V | ||
| A86-26 (GND1) - Body ground | Ground | Always | Below 1 Ω |
(e) Reconnect the A85 and A86 semiconductor power integration ECU connectors.
(f) Measure the voltage and check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Terminal Description | Condition | Specified Condition |
|---|---|---|---|
| A86-8 (CXPI) - Body ground | CXPI communication line | Ignition switch ON | Pulse generation |
| A86-1 (L) - Body ground | Light control LED ECU LH operation signal output | Headlight not illuminated | Below 3.0 V |
| Headlight illuminated | 8 V or higher | ||
| A86-2 (L)- Body ground | Light control LED ECU RH operation signal output | Headlight not illuminated | Below 3.0 V |
| Headlight illuminated | 8 V or higher | ||
| A86-17 (L) - Body ground | Front fog light RH operation signal output | Front fog light not illuminated | Below 3.0 V |
| Front fog light illuminated | 8 V or higher | ||
| A86-18 (L) - Body ground | Front fog light LH operation signal output | Front fog light not illuminated | Below 3.0 V |
| Front fog light illuminated | 8 V or higher |
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use these procedures to troubleshoot the CXPI communication system.
*: Use the GTS.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
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2...
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Refueling
Before refueling, close all the doors, windows, and the liftgate/trunk lid, and switch the ignition OFF.
To open the fuel-filler lid, pull the remote fuel-filler lid release.
