Inspection Procedure

1. Start the navigation system and check that the voice recognition microphone function operates normally.
   1. If the microphone function is normal, proceed to A.
   2. If the microphone function is malfunctioning, proceed to B.

B:  Go to NAVIGATION SYSTEM

A: Go to next step 

1. Disconnect the U45 ECU connector.
2. Disconnect the W6 map light connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   U45-7 (MCVD) - W6-19 (ACC)	Below 1 Ω
   U45-7 (MCVD) or W6-19 (ACC) - Body ground	10 kΩ or higher

Fig 1: Identifying U45 ECU Connector And W6 MAP Light Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR THEN CLEAR HISTORIC DTC 

OK: Go to next step 

1. Disconnect the W6 map light connector.
2. Measure the resistance of the wire harness side connector.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   W6-31 (GND3) - Body ground	Below 1 Ω

Fig 2: Identifying W6 MAP Light Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR THEN CLEAR HISTORIC DTC 

OK: Go to next step 

1. Temporarily replace the map light with a new or normally functioning one.
2. Check that the DTC 4-3 is output.

   OK: 

   DTC 4-3 is not output. 

NG: REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION 

OK: END (MAP LIGHT IS FAULTY; CLEAR HISTORIC DTC)