Inspection Procedure

WARNING: This page is about a different car, the 2003 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

Inspect Navigation ECU (+B, ACC, GND)
1. Remove the navigation ECU with connectors with still connected.
  
  Fig 1: Measuring Voltage Between Terminals +B, ACC And GND Of Navigation ECU
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check voltage.
  1. Measure voltage between terminals +B, ACC and GND of navigation ECU at each conditions, as shown in the chart.
  Standard:
  
  Fig 2: Navigation ECU Connector Terminals Voltage Check Reference Table (Between +B, ACC, GND)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check continuity.
  1. Check that the continuity exists between terminal GND of navigation ECU and body ground.
    Standard: Continuity exists.
1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK : GO TO NEXT STEP

Inspect Navigation ECU (SYNC, VR, VG)

Check continuity.
1. Check that the continuity exists between each terminals, as shown in the chart.
  
  Fig 3: Measuring Continuity Between Terminals SYNC, VR And VG Of Navigation ECU
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard:

Fig 4: Navigation ECU Connectors Terminals Continuity Check Reference Table (SYNC, VR, VG)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check signal waveform.
1. Using an oscilloscope, check signal waveform between terminals SYNC and GND of navigation ECU

NAVIGATION ECU CONTENTS REFERENCE

Item	Contents
Tool setting	500 mV/DIV, 10 us/DIV
Condition	Navigation display is displayed

NOTE: Signal wave from is shown in the chart.

NG : CHECK AND REPLACE RADIO RECEIVER ASSY
OK : GO TO NEXT STEP

Inspect Radio Receiver Assy (SYNC, VR, VG)
1. Check continuity.
  1. Check that the continuity exists between each terminals, as shown in the chart.
    
    Fig 6: Measuring Continuity Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  Standard:
  
  Fig 7: Continuity Check Reference Table (SYNC, VR, VG)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check signal waveform.
  1. Using an oscilloscope, check signal waveform between terminals SYNC and GND of radio receiver assy.
    
    Fig 8: Identifying Radio Receiver Assembly Signal Wave (Between SYNC And GND)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 9: Radio Receiver Assembly Item Contents Reference Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: Signal wave from is shown in the chart.
1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK : CHECK AND REPLACE RADIO RECEIVER ASSY