Code No.B2468 Microphone input short to BATT
Code No.B2470 Microphone input short to earth


caution
  • Before replacing the ECU, ensure that the communication circuit is normal.








JUDGMENT CRITERIA



PROBABLE CAUSES



  • Malfunctions of hands free-ECU
  • Malfunction of the microphone unit
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-122 hands free-ECU connector, D-01 microphone unit connector

Q. Is the check result normal?
Go to Step 2.
Repair the defective connector.

STEP 2. Check the wiring harness between C-122 hands free-ECU connector and D-01 microphone unit connector.
(1)Disconnect C-122 hands free-ECU connector and D-01 microphone unit connector, and check the wiring harness.
note Prior to the wiring harness inspection, check intermediate connector C-40 , and repair if necessary.
(2)Check the wiring harness between C-122 hands free-ECU connector terminal No.22 and D-01 microphone unit connector terminal No.1
(3)Check the wiring harness between C-122 hands free-ECU connector terminal No.23 and D-01 microphone unit connector terminal No.1
(4)Check the wiring harness between C-122 hands free-ECU connector terminal No.24 and D-01 microphone unit connector terminal No.2

Q. Is the check result normal?
Go to Step 3.
Repair the wiring harness.

STEP 3. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the hands free-ECU.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.

Q. Is the diagnosis code set?
Go to Step 4.
The procedure is complete.

STEP 4. Temporarily replace the microphone unit, and check whether the diagnosis code is reset.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.

Q. Is the check result normal?
Replace the microphone unit.
Replace the hands free-ECU.