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Home >> Lexus >> 2005 >> RX 330 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 521 (Multiplex Communication) >> Multiplex Communication System >> DTC B1247: Tire Pressure Monitor Receiver Communication Stop >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

When "+B or GND short malfunction of communication bus" DTCs (B1266 and B1267) are detected at the same time as "communication stop" DTC B1247, repair the "+B or GND short malfunction of communication bus" DTCs first.

  1. INSPECT FUSES (ALT, INP-J/B, ECU-IG NO. 1) 
    1. Remove the ALT and INP-J/B (*1) fuses from the fusible link block.

      HINT:

      *1: without Air Suspension System

    2. Remove the ECU-IG No. 1 fuse from the instrument panel J/B.
    3. Measure the resistance of the fuses.

      Standard resistance: 

      Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go to Next Step 

  2. CHECK WIRE HARNESS (TIRE PRESSURE MONITOR ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the T23 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.

      Standard voltage 

      VOLTAGE SPECIFICATION TABLE

      Tester Connection Condition Specified Condition
      IG (T23-1) - Body ground Turn the ignition switch to the ON position 10 to 14 V

      Standard resistance 

      RESISTANCE SPECIFICATION TABLE

      Tester Connection Specified Condition
      GND (T23-7) - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  3. CHECK RESISTANCE COMMUNICATION LINE 
    Fig 1: Identifying T23, G3, T4 & P22 ECU Connector Terminals
    G05274998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T23, G3, T4 and P22 ECU connectors.
    2. Measure the resistance between the specified terminals on the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFICATION TABLE

      Tester Connection Specified Condition
      MPX2 (T23-12) - MPD2 (G3-12) Below 1 Ω
      MPX1 (T23-6) - MPX2 (T4-14) (*1) Below 1 Ω
      MPX1 (T23-6) - MPX1 (P22-7) (*2) Below 1 Ω
      HINT:
      *1: with Power Tilt and Power Telescopic
      *2: without Power Tilt and Power Telescopic

      Result 

      RESULT TABLE

      Result Proceed to
      Both are OK A
      One is OK B
      Both are NG C

    B: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    C: REPLACE TIRE PRESSURE MONITOR ECU AND REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A: REPLACE TIRE PRESSURE MONITOR ECU 

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