DTC B150A: Lost Communication with HMI-LAN [09/2014 - 11/2017]: Procedure

1. w/ Navigation System
   1. Check if navigation system DTCs are output.

      Refer to DTC CHECK / CLEAR [09/2014 - 11/2017]

      Body Electrical > Navigation System > Trouble Codes 

      OK

      Navigation system DTCs are not output.

2. w/ Audio and Visual System
   1. Check if audio and visual system DTCs are output.

      Refer to DTC CHECK / CLEAR [09/2014 - 11/2017]

      Body Electrical > Navigation System > Trouble Codes 

      OK

      Audio and visual system DTCs are not output.

   Result

   Result	Proceed to
   Navigation system DTCs are not output.	A
   Audio and visual system DTCs are not output.
   Navigation system DTCs are output. (w/ Navigation System)	B
   Audio and visual system DTCs are output. (w/ Audio and Visual System)	C

Result: 

B 

GO TO NAVIGATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017] 

Result: 

C 

GO TO AUDIO AND VISUAL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017] 

Result: 

A 

See step  2

1. Disconnect the O4 combination meter assembly connector.
2. Disconnect the O57 radio receiver assembly connector*1.
3. Disconnect the O71 radio receiver assembly connector*2.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O4-2 (MSCL) - O57-21 (CNL2)*1	Always	Below 1 Ω
   O4-3 (MSCH) - O57-20 (CNH2)*1	Always	Below 1 Ω
   O4-2 (MSCL) - O71-4 (CNL1)*2	Always	Below 1 Ω
   O4-3 (MSCH) - O71-3 (CNH1)*2	Always	Below 1 Ω
   O4-2 (MSCL) - Body ground	Always	10 kΩ or higher
   O4-3 (MSCH) - Body ground	Always	10 kΩ or higher

   1. *1: w/ Navigation System
   2. *2: w/ Audio and Visual System

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Replace the combination meter assembly with a new or known good one.

   Refer to REMOVAL [09/2014 - ]

2. Turn the engine switch on (IG) and wait 30 seconds.
   NOTE:

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

3. Operate the steering pad switch assembly and check that the audio tab illuminates.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Multi-information Display
   *b	Audio Tab

4. Check for DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - ]

   Body Electrical > Combination Meter > Trouble Codes 

   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. (w/ Navigation System)	B
   The audio tab does not illuminate and DTC B150A is output. (w/ Audio and Visual System)	C

Result: 

A 

END 

Result: 

B 

REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2014 - 11/2017] 

Result: 

C 

REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2014 - 11/2017]