Toyota Yaris: Cxpi Communication System / Power Integration No.1 System Missing Message (B235287,B235587,B235787-B235987)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Power Source & Network / Networking / Cxpi Communication System / Power Integration No.1 System Missing Message (B235287,B235587,B235787-B235987)

DESCRIPTION

This DTC is stored when CXPI communication between the semiconductor power integration ECU, power distribution box assembly, windshield wiper relay assembly or light control LED ECU and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B235287

Power Integration No.1 System Missing Message

No communication between semiconductor power integration ECU and main body ECU (multiplex network body ECU) for 10 seconds or more

  • Main body ECU (multiplex network body ECU)
  • Semiconductor power integration ECU
  • Harness or connector

B235587

Power Distribution Box Missing Message

No communication between power distribution box assembly and main body ECU (multiplex network body ECU) for 10 seconds or more

  • Main body ECU (multiplex network body ECU)
  • Power distribution box assembly

B235787

Wiper Module Missing Message

No communication between windshield wiper relay assembly and main body ECU (multiplex network body ECU) for 10 seconds or more

  • Main body ECU (multiplex network body ECU)
  • Windshield wiper relay assembly
  • Harness or connector

B235887

Smart LDM Left Missing Message

No communication between light control LED ECU LH and main body ECU (multiplex network body ECU) for 10 seconds or more

  • Main body ECU (multiplex network body ECU)
  • Light control LED ECU LH
  • Harness or connector

B235987

Smart LDM Right Missing Message

No communication between light control LED ECU RH and main body ECU (multiplex network body ECU) for 10 seconds or more

  • Main body ECU (multiplex network body ECU)
  • Light control LED ECU RH
  • Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).
  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Registration.
  • When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

    Click here

  • Some parts must be initialized and set when replacing or removing and installing parts.

    Click here

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

B235287, B235587, B235787, B235887 and B235987 are output

A

B235287, B235787, B235887 and B235987 are output

B

Only B235587 is output

C

Only B235287 is output

D

Only B235787 is output

E

Only B235887 is output

F

Only B235987 is output

G

DTCs are not output

H

B

GO TO STEP 4

C

GO TO STEP 6

D

GO TO STEP 7

E

GO TO STEP 9

F

GO TO STEP 11

G

GO TO STEP 13

H

USE SIMULATION METHOD TO CHECK

A

3.

CHECK POWER DISTRIBUTION BOX ASSEMBLY

(a) Remove the power distribution box assembly.

Click here

(b) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

(c) Disconnect the 4D power distribution box assembly connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection

Condition

Specified Condition

MB-22 (CXPI) - 4D-5

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

4.

CHECK POWER DISTRIBUTION BOX ASSEMBLY

(a) Remove the power distribution box assembly.

Click here

(b) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

(c) Disconnect the 4D power distribution box assembly connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

MB-22 (CXPI) - 4D-5

Always

Below 1 Ω

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

OK

5.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - SEMICONDUCTOR POWER INTEGRATION ECU)

(a) Disconnect the cable from the negative (-) auxiliary battery terminal.

(b) Disconnect the 4D power distribution box assembly connector.

(c) Disconnect the A49 windshield wiper relay assembly connector.

(d) Disconnect the A4 light control LED ECU LH connector.

(e) Disconnect the A5 light control LED ECU RH connector.

(f) Disconnect the A86 semiconductor power integration ECU connector.

(g) Measure the voltage according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

4D-5 - A86-8 (CXPI)

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

4D-5 - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR POWER INTEGRATION ECU - BATTERY AND BODY GROUND)

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

(c) Disconnect the 4B and 4C power distribution box assembly connectors.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

4C-41 (GND1) - Body ground

Always

Below 1 Ω

4B-44 (GND2) - Body ground

Always

Below 1 Ω

4B-36 (GND3) - Body ground

Always

Below 1 Ω

4C-25 (GND4) - Body ground

Always

Below 1 Ω

(e) Connect the cable to the negative (-) auxiliary battery terminal.

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

4G-1 (+B1) - Body ground

Ignition switch off

11 to 14 V

4F-1 (+B2) - Body ground

Ignition switch off

11 to 14 V

4H-1 (+B3) - Body ground

Ignition switch off

11 to 14 V

4D-23 (+B4) - Body ground

Ignition switch off

11 to 14 V

4B-11 (IGR) - Body ground

Ignition switch ON

11 to 14 V

4C-17 (IGP) - Body ground

Ignition switch ON

11 to 14 V

OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR POWER INTEGRATION ECU - BATTERY AND BODY GROUND)

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

(c) Disconnect the A85 and A86 semiconductor power integration ECU connectors.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A86-26 (GND1) - Body ground

Always

Below 1 Ω

(e) Connect the cable to the negative (-) auxiliary battery terminal.

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A85-1 (+B) - Body ground

Ignition switch ON

8 to 14 V

A86-20 (IG) - Body ground

Ignition switch ON

8 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR POWER INTEGRATION ECU - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

(c) Disconnect the 4D power distribution box assembly connector.

(d) Disconnect the A86 semiconductor power integration ECU connector.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A86-8 (CXPI) - 4D-5

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A86-8 (CXPI) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

10 kΩ or higher

OK

REPLACE SEMICONDUCTOR POWER INTEGRATION ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - BATTERY AND BODY GROUND)

(a) Disconnect the A49 and A50 windshield wiper relay assembly connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A49-5 (ES) - Body ground

Always

Below 1 Ω

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A50-6 (IGWS) - Body ground

Ignition switch ON

11 to 14 V

A50-8 (+B) - Body ground

Ignition switch ON or less than approximately 60 seconds after ignition switch turned off

11 to 14 V

A50-8 (+B) - Body ground

Approximately 60 seconds or more after ignition switch turned off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.

CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

(c) Disconnect the A49 windshield wiper relay assembly connector.

(d) Disconnect the 4D power distribution box assembly connector.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A49-4 (MPX1) - 4D-5

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A49-4 (MPX1) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

10 kΩ or higher

OK

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.

CHECK HARNESS AND CONNECTOR (LIGHT CONTROL LED ECU LH - BATTERY AND BODY GROUND)

(a) Disconnect the A4 light control LED ECU LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A4-5 (E) - Body ground

Always

Below 1 Ω

Standard Voltage:

Tester Connection

Condition

Specified Condition

A4-2 (LO) - Body ground

Taillight on

9.5 to 14 V

A4-2 (LO) - Body ground

Taillight off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

12.

CHECK HARNESS AND CONNECTOR (LIGHT CONTROL LED ECU LH - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

(c) Disconnect the A4 light control LED ECU LH connector.

(d) Disconnect the 4D power distribution box assembly connector.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A4-1 (AT1) - 4D-5

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A4-1 (AT1) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

10 kΩ or higher

OK

REPLACE LIGHT CONTROL LED ECU LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.

CHECK HARNESS AND CONNECTOR (LIGHT CONTROL LED ECU RH - BATTERY AND BODY GROUND)

(a) Disconnect the A5 light control LED ECU RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A5-5 (E) - Body ground

Always

Below 1 Ω

Standard Voltage:

Tester Connection

Condition

Specified Condition

A5-2 (LO) - Body ground

Taillight on

9.5 to 14 V

A5-2 (LO) - Body ground

Taillight off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

14.

CHECK HARNESS AND CONNECTOR (LIGHT CONTROL LED ECU RH - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

(c) Disconnect the A5 light control LED ECU RH connector.

(d) Disconnect the 4D power distribution box assembly connector.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A5-1 (AS1) - 4D-5

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A5-1 (AS1) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

10 kΩ or higher

OK

REPLACE LIGHT CONTROL LED ECU RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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