Inspection Procedure

HINT:

If DTC B2508 and B2538 are output simultaneously, luggage door drive motor LH circuit may be open.

Perform troubleshooting of DTC B2508 first.

READ VALUE OF LEXUS HAND-HELD TESTER (LUGGAGE DOOR DRIVE MOTOR PULSE)
1. Read the LUGGAGE PULSE/L signal on the LEXUS hand-held tester.
  OK:
  
  12288 - 20480
1. OK: CHECK AND REPLACE SLIDING ROOF CONTROL ECU ASSEMBLY
2. NG: GO TO NEXT STEP.
CHECK ECU TERMINAL VOLTAGE
1. Remove the luggage compartment trim cover inner lower, see OVERHAUL .
2. Measure voltage between terminals RPLB and RPLE of sliding roof control ECU, see TERMINALS OF ECU .
  OK:
  
  Voltage: 7 - 9 V
1. NG: CHECK AND REPLACE SLIDING ROOF CONTROL ECU ASSEMBLY
2. OK: GO TO NEXT STEP.
CHECK HARNESS AND CONNECTOR (LPL, LPLB AND LPLE OF SLIDING ROOF CONTROL ECU ASSEMBLY - SLIDING ROOF DRIVE GEAR ASSEMBLY LH)
1. NG: CHECK AND REPLACE HARNESS OR CONNECTOR
2. OK: GO TO NEXT STEP.
INSPECT LUGGAGE DOOR DRIVE GEAR ASSEMBLY LH (PULSE CIRCUIT OPERATION)
1. Connect the positive (+) lead from the TOYOTA electrical tester to terminal 5 and negative (-) lead to terminal 4.
2. Connect 5 dry batteries of 1.5 V in series.
3. Connect terminal 6 to the dry batteries' positive (+) terminal, and terminal 4 to the dry batteries' negative (-) terminal.
  
  Fig 1: Inspecting Luggage Door Drive Gear Assembly LH (Pulse Circuit Operation)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Connect the positive (+) lead from the battery to terminal 1, and negative (-) lead to terminal 3.
5. Check that the output voltage of terminal 4 and 5.
  OK:
  
  Pulse is generated during motor running
6. Reverse the polarity terminal 1 and 3.
7. Check that the output voltage of terminal 4 and 5.
  OK:
  
  Pulse is generated during motor running
  
  Fig 2: Motor Running Pulse Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE LUGGAGE DOOR DRIVE GEAR ASSEMBLY LH
2. OK: CHECK AND REPLACE SLIDING ROOF CONTROL ECU ASSEMBLY