Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Lost Communication with HMI-LAN (B150A)

DESCRIPTION

The combination meter assembly receives a text data signal from the navigation receiver assembly or radio and display receiver assembly via local bus communication.

Based on this signal, navigation system information is displayed on the multi-information display.

This DTC is stored when the combination meter assembly cannot receive the signal.

DTC No.

DTC Detection Condition

Trouble Area

B150A

After the combination meter assembly receives a registration information signal, which is sent by the navigation receiver assembly when the ignition switch is ACC, 1 or more times, the combination meter assembly cannot receive the signal for 30 seconds or more.

  • Harness or connector
  • Navigation receiver assembly*1
  • Radio and display receiver assembly*2
  • Combination meter assembly
  • *1: for Navigation Receiver Type
  • *2: for Radio and Display Type

WIRING DIAGRAM

PROCEDURE

PROCEDURE

1.

CHECK FOR DTC

(a) Check if Navigation System or Audio and Visual System DTCs are output.

  • for Navigation Receiver type: (See page for Radio and Display type: (See page )
  • for Radio and Display type: (See page )

OK:

Navigation system DTCs are not output.

Result

Result

Proceed to

Navigation system DTCs are not output*1

A

Navigation system DTCs are output*1

B

Audio and visual system are not output*2

C

Audio and Visual System are output*2

D

  • *1: for Navigation Receiver Type
  • *2: for Radio and Display Type
B

GO TO NAVIGATION SYSTEM

C

GO TO STEP 4

D

GO TO AUDIO AND VISUAL SYSTEM

A

2.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NAVIGATION RECEIVER ASSEMBLY)

(a) Disconnect the C9 combination meter assembly connector.

(b) Disconnect the N26 navigation receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C9-4 (MSCH) - N26-3 (CNH1)

Always

Below 1 Ω

C9-5 (MSCL) - N26-4 (CNL1)

Always

Below 1 Ω

C9-4 (MSCH) or N26-3 (CNH1) - Body ground

Always

10 kΩ or higher

C9-5 (MSCL) or N26-4 (CNL1) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

REPLACE COMBINATION METER ASSEMBLY

(a) Replace the combination meter assembly with a new or known good one (See page (b) Turn the ignition switch to ON and wait 30 seconds. (b) Turn the ignition switch to ON and wait 30 seconds. ).

(b) Turn the ignition switch to ON and wait 30 seconds.

NOTICE:

A maximum of 30 seconds is required to send/receive the registration information between the combination meter assembly and navigation receiver assembly.

(c) Operate the steering pad switch assembly and check that the audio tab illuminates.

(d) Check for DTCs (See page Result ).

Result

Result

Proceed to

The audio tab illuminates and DTC B150A is not output

A

The audio tab does not illuminate and DTC B150A is output

B

The audio tab does not illuminate and DTC B150A is output

C

A

END (COMBINATION METER ASSEMBLY WAS DEFECTIVE)

B

REPLACE NAVIGATION RECEIVER ASSEMBLY

C

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

4.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Disconnect the C9 combination meter assembly connector.

(b) Disconnect the R32 radio and display receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C9-4 (MSCH) - R32-3 (CNH1)

Always

Below 1 Ω

C9-5 (MSCL) - R32-4 (CNL1)

Always

Below 1 Ω

C9-4 (MSCH) or R32-3 (CNH1) - Body ground

Always

10 kΩ or higher

C9-5 (MSCL) or R32-4 (CNL1) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

REPLACE COMBINATION METER ASSEMBLY

(a) Replace the combination meter assembly with a new or known good one (See page (b) Turn the ignition switch to ON and wait 30 seconds. (b) Turn the ignition switch to ON and wait 30 seconds. ).

(b) Turn the ignition switch to ON and wait 30 seconds.

NOTICE:

A maximum of 30 seconds is required to send/receive the registration information between the combination meter assembly and navigation receiver assembly.

(c) Operate the steering pad switch assembly and check that the audio tab illuminates.

(d) Check for DTCs (See page Result ).

Result

Result

Proceed to

The audio tab illuminates and DTC B150A is not output

A

The audio tab does not illuminate and DTC B150A is output

B

A

END (COMBINATION METER ASSEMBLY WAS DEFECTIVE)

B

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

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