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Home >> Infiniti >> 2008 >> M45 x >> Repair and Diagnosis >> External Pages >> Different car >> Section 120 (Can Communication System) >> Can Communication System >> DTC U0208: Lost Communication with "Seat Control Module A" >> Inspection Procedure
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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
      CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
      NOTE: After the ignition switch is turned OFF, the navigation system requires approximately 90 seconds to record various types of memory and settings. As a result, after turning the ignition switch OFF, wait 90 seconds or more before disconnecting the cable from the negative (-) battery terminal.
  2. CHECK FOR OPEN IN CAN BUS WIRE (FRONT POWER SEAT CONTROL ECU AND SWITCH LH BRANCH WIRE) 
    1. Disconnect the Z10 front power seat control ECU and switch LH connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION TABLE

      Tester Connection Switch Condition Specified Condition
      Z10-5 (CANH) - Z10-1 (CANL) Ignition switch OFF 54 to 69 Ω
      Fig 1: Identifying Z10 Front Power Seat Control ECU And Switch LH Connector Terminals
      G05163414Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE FRONT POWER SEAT CONTROL ECU AND SWITCH LH BRANCH WIRE OR CONNECTOR (CANH, CANL) 

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT CONTROL ECU AND SWITCH LH - BATTERY AND BODY GROUND) 
    1. Reconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
    2. Disconnect the Z9 and Z10 front power seat control ECU and switch LH connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION TABLE

      Tester Connection Condition Specified Condition
      Z9-1 (GND) - Body ground Always Below 1 Ω
    4. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION TABLE

      Tester Connection Switch Condition Specified Condition
      Z9-5 (+B) - Body ground Always 11 to 14 V
      Z10-8 (SYSB) - Body ground
      Z10-4 (IG) - Body ground Ignition switch ON
      Fig 2: Identifying Z9 And Z10 Front Power Seat Control ECU And Switch LH Connector Terminals
      G05163415Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY  (See REMOVAL )

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