DTC B1AA1-87: UART Communication Between ANC and Audio Amplifier Missing Message [06/2018 - 09/2022]: Procedure

1. Clear the DTCs.

   Body Electrical > Active Noise Control > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Check for DTCs with all of the detection conditions met.

   Body Electrical > Active Noise Control > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ] 

Result: 

NG 

See step  3

1. Disconnect the G15 stereo component equalizer assembly connector.
2. Disconnect the G12 stereo component amplifier assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G15-2 (ACK1) - G12-2 (ACK1)	Always	Below 1 Ω
   G15-16 (ACK2) - G12-10 (ACK2)	Always	Below 1 Ω
   G15-2 (ACK1) or G12-2 (ACK1) - Body ground	Always	10 kΩ or higher
   G15-16 (ACK2) or G12-10 (ACK2) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Replace the stereo component amplifier assembly with a new or known good one.

   Refer to REMOVAL [06/2018 - 09/2022]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Clear the DTCs.

   Body Electrical > Active Noise Control > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Check for DTCs with all of the detection conditions met.

   Body Electrical > Active Noise Control > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (STEREO COMPONENT AMPLIFIER ASSEMBLY IS DEFECTIVE) 

Result: 

NG 

REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY. Refer to  REMOVAL [06/2018 - ]