DTC C1799: Luggage Room Mode Switch Circuit (Test Mode DTC) (TO 08/2009): Procedure

1. Disconnect the height control switch (luggage compartment) connector.
   Fig 1: Inspecting Height Control Switch (Driver Seat)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the values in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   1 (LSW) - 8 (IGH)	Height control switch while pressing "UP" button	10 kΩ or higher
   	Height control switch while pressing "DOWN" button	Below 1 Ω
   	Neutral position	10 kΩ or higher
   2 (HSW) - 8 (IGH)	Height control switch while pressing "UP" button	Below 1 Ω
   	Height control switch while pressing "DOWN" button	10 kΩ or higher
   	Neutral position	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Height Control Switch)

NG → See step   4 

OK: Go to next step 

1. Disconnect the A56 ECU connector.
   Fig 2: Identifying A56 ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the O26 height control switch (luggage compartment) connector.
3. Measure the resistance according to the values in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   O26-1 (LSW) - A56-22 (LDNS)	Always	Below 1 Ω
   O26-2 (HSW) - A56-23 (LUPS)	Always	Below 1 Ω
   A56-22 (LDNS) - Body ground	Always	10 kΩ or higher
   A56-23 (LUPS) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Height Control Switch)
   *2	Rear view of wire harness connector (to Suspension Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   3