Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT TELEPHONE ANTENNA ASSEMBLY (GPS ANTENNA) AND ANTENNA CORD SUB-ASSEMBLY

Disconnect the antenna connector from the ECU.

Fig 1: Identifying Antenna Cord Sub-Assembly Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
1 (SIGNAL) - Body ground	Always	50 to 500 Ω

Result

RESULT CHART

Result	Proceed to
Result is outside specified range	A
Result is within specified range	B

B: Go to step 3

A: Go to next step

INSPECT ANTENNA CORD SUB-ASSEMBLY

Disconnect the antenna cord connector from the ECU.

Fig 2: Inspecting Antenna Cord Sub-Assembly

Disconnect the antenna cord connector from the telephone antenna
Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
1 (SIGNAL) - 1	Always	Below 1 Ω
Either terminal 1 - Body ground	Always	10 kΩ or higher

NG: REPLACE ANTENNA CORD SUB-ASSEMBLY THEN CLEAR HISTORIC DTC

OK: Go to next step

CHECK MAYDAY ECU (OPERATION)
1. Temporarily replace the mayday ECU and mayday battery with a new one.
2. Check for the current DTC again (see DTC CHECK / CLEAR ).
  OK: System operates normally (red LED off).
  
  NG:
  
  Current DTC 3-1 exists.
  
  NG: REPLACE TELEPHONE ANTENNA ASSEMBLY (GPS ANTENNA) THEN CLEAR HISTORIC DTC
  
  OK: END (MAYDAY ECU IS FAULTY; PERFORM REGISTRATION)