LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2005 >> RX 330 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 521 (Multiplex Communication) >> Multiplex Communication System >> DTC B1206: P/W Master Switch 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 (B1214 and B1215) are detected at the same time as "communication stop" DTC B1206, repair the "+B or GND short malfunction of communication bus" DTCs first.

  1. INSPECT FUSE (ECU-B) 
    1. Remove the ECU-B fuse from the fusible link block.
    2. Measure the resistance of the fuse.

      Standard resistance: 

      Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go to Next Step 

  2. CHECK WIRE HARNESS (POWER WINDOW MASTER SWITCH - BATTERY AND BODY GROUND) 
    Fig 1: Identifying P22 Power Window Master Switch Connector Terminals
    G05274975Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the P22 switch connector.
    2. Measure the voltage and resistance of the wire harness side connector.

      Standard voltage 

      VOLTAGE SPECIFICATION TABLE

      Tester Connection Condition Specified Condition
      CPUB (P22-9) - Body ground Always 10 to 14 V

      Standard resistance 

      RESISTANCE SPECIFICATION TABLE

      Tester Connection Specified Connection
      GND (P22-2) - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

  3. CHECK RESISTANCE OF COMMUNICATION LINE 
    Fig 2: Identifying P22, T4, T23, G3 & 1E ECU Connector Terminals
    G05274976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the P22, T4, T23, G3 and 1E 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
      MPX1 (P22-7) - MPX1 (T4-5) H) Below 1 Ω
      MPX1 (P22-7) - MPX1 (T23-6) (*V4) Below 1 Ω
      MPX1 (P22-7) - MPD2 (G3-12) (*2, *4) Below 1 Ω
      MPX2 (P22-8) - MPX1 (1E-7) Below 1 Ω
      HINT:
      *1: with Tire Pressure Warning System
      *2: without Tire Pressure Warning System
      *3: with Power Tilt and Power Telescopic
      *4: 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 AND REPLACE POWER WINDOW MASTER SWITCH 

    C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A: REPLACE POWER WINDOW MASTER SWITCH 

scientia non olet · About LEMON Manuals