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Diagnostic Trouble Code Chart

~3min read
DIAGNOSTIC TROUBLE CODE CHART Main Body ECU (Driver Side junction Block Assembly)

DTC Code

Detection Item

Trouble Area

See page

B1206

P/W Master Switch Communication Stop

1. Multiplex network master switch assembly

2. Main body ECU (Driver side junction block assembly)

3. Wire harness or connector

4. ECU-B NO. 2 fuse

B124D

Lost Communication with AFS LIN

1. Inner rear view mirror assembly

2. Wire harness or connector

3. AFS ECU (headlight swivel ECU assembly)

B1273

Sliding Roof ECU Communication Stop

1. Sliding roof ECU (Sliding roof drive gear assembly)

2. Main body ECU (Driver side junction block assembly)

3. Wire harness or connector

4. S/R fuse

B2287

LIN Communication Master Malfunction

1. Multiplex network master switch assembly

2. Main body ECU (Driver side junction block assembly)

3. Wire harness or connector

B2321

Driver Side Door ECU Communication Stop

1. Power window regulator motor assembly (for Driver side)

2. Main body ECU (Driver side junction block assembly)

3. Multiplex network master switch assembly

4. Wire harness or connector

5. FL DOOR fuse

B2322

Front Passenger Side Door ECU Communication Stop

1. Power window regulator motor assembly (for Front passenger side)

2. Main body ECU (Driver side junction block assembly)

3. Wire harness or connector

4. FR DOOR fuse

B2323

Rear Door RH ECU Communication Stop

1. Power window regulator motor assembly (for Rear RH side)

2. Main body ECU (Driver side junction block assembly)

3. Wire harness or connector

4. RR DOOR fuse

B2324

Rear Door LH ECU Communication Stop

1. Power window regulator motor assembly (for Rear LH side)

2. Main body ECU (Driver side junction block assembly)

3. Wire harness or connector

4. RL DOOR fuse

B2325

LIN Communication Bus Malfunction

1. Power window regulator motor assembly (for Driver side)

2. Power window regulator motor assembly (for Front passenger side)

3. Power window regulator motor assembly (for Rear RH side)

4. Power window regulator motor assembly (for Rear LH side)

5. Multiplex network master switch assembly

6. Sliding roof ECU (Sliding roof drive gear assembly)

7. Main body ECU (Driver side junction block assembly)

8. Wire harness or connector

Certification ECU (Smart Key ECU Assembly)

DTC Code

Detection Item

Trouble Area

See page

B2785

Communication Malfunction between ECUs Connected by LIN

1. Certification ECU (Smart key ECU assembly)

2. Power source control ECU (Power management control computer assembly)

3. Steering lock ECU (Steering lock actuator assembly)

4. Wire harness or connector

B2786

No Response from Steering Lock ECU

1. Steering lock ECU (Steering lock actuator assembly)

2. Certification ECU (Smart key ECU assembly)

3. Wire harness or connector

4. STR LOCK fuse

B278C

Lost Communication with Power Source Control

1. Power source control ECU (Power management control computer assembly)

2. Certification ECU (Smart key ECU assembly)

3. Wire harness or connector

4. AM2 fuse

AFS ECU (headlight swivel ECU assembly)

DTC Code

Detection Item

Trouble Area

See page

B2432

Lost Communication with Automatic High Beam Sensor

1. Inner rear view mirror assembly

2. Wire harness or connector

3. AFS ECU (headlight swivel ECU assembly)

Test yourself

A quick Toyota Venza quiz: every answer comes with an explanation and a link to the manual page.