Diagnosis System

1. Check the DLC3 (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).

1. Measure the battery voltage.

   Standard Voltage: 11 to 14 V 

   If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

HINT

If there is a malfunction in the pulse sensor, manually operating the multiplex network master switch assembly or multiplex network switch assembly will cause the multiplex network master switch assembly or multiplex network switch assembly LED illumination to blink. The LED illumination continues to blink for 45 seconds or until the engine switch is turned off. After 45 seconds, the multiplex network master switch assembly or multiplex network switch assembly LED illumination remains on.

1. Multiplex network master switch assembly
   1. Turn the engine switch on (IG)
   2. Manually operate the multiplex network master switch assembly at each door
   3. Check the blinking pattern of the AUTO light is as shown in the LED illustration.
      Fig 1: LED Blinking Pattern Chart

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Multiplex network switch assembly (Front passenger, rear LH or rear RH side)
   1. Turn the engine switch on (IG).
   2. Manually operate the multiplex network switch assembly at each door
   3. Check the blinking pattern of the AUTO light is as shown in the LED illustration.
      Fig 2: LED Blinking Pattern Chart

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002