DTC C1799/99: Access Mode Switch Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to the ON position, and push the Techstream main switch on.
3. Select the item below in the DATA LIST, and read its value displayed on the Techstream.

   Air suspension

   Item	Normal Condition
   Access Mode Switch	ON: Access mode switch pressing OFF: -

4. Check that the value displayed on the Techstream changes by pressing the access mode switch.

   OK

   Access mode switch value changes.

NG → Go to next step 

OK → REPLACE SUSPENSION CONTROL ECU 

1. Disconnect the access mode switch connector.
   Fig 1: Identifying Access Mode Switch Connector Terminals

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

   Standard resistance

   Switch Condition	Tester Connection	Specified Condition
   Pushed in	3 (LMSW) - 4 (GND)	Below 1 Ω
   Free	3 (LMSW) - 4 (GND)	10 kΩ or higher

NG → REPLACE ACCESS MODE SWITCH 

OK: Go to next step 

1. Disconnect the suspension control ECU S16 connector.
   Fig 2: Identifying Suspension Control ECU Connector Terminals

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

   Standard resistance

   Tester Connection	Specified Condition
   S16-3 (LMSW) - A13-3 (LMSW)	Below 1 Ω
   S16-3 (LMSW) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the values in the table below.
   Fig 3: Identifying Access Mode Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Specified Condition
   A13-4 (GND) - Body ground	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE SUSPENSION CONTROL ECU