Inspection Procedure

1. Disconnect the L23 selector connector.
2. Using an oscilloscope, check the signal waveform between each terminal and body ground according to the conditions shown in the chart below.
   Fig 1: Identifying L23 Selector Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   L23-13 (L6-) - Body ground	Audio sound is being produced	A waveform synchronized with sound is output
   L23-14 (L6+) - Body ground
   L23-15 (R6-) - Body ground
   L23-16 (R6+) - Body ground

NG: Go to step 2 

OK: REPLACE MULTI-DISPLAY SELECTOR  (See REMOVAL  )

1. Check if the SDARS system is equipped on the vehicle.

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   w/ SDARS System	A
   w/o SDARS System	B

B:  Go to step  5

A: Go to next Step 

1. Disconnect the F24 receiver connector.
2. Disconnect the L37 and L39 tuner connectors.
3. Disconnect the L23 selector connector.
4. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   F24-2 (CDR+) - L37-2 (FRO+)	Always	Below 1 Ω
   F24-3 (CDR-) - L37-3 (FRO-)
   F24-4 (CDL+) - L37-4 (FLO+)
   F24-5 (CDL-) - L37-5 (FLO-)
   L39-10 (FRI+) - L23-16 (R6+)
   L39-9 (FRI-) - L23-15 (R6-)
   L39-8 (FLI+) - L23-14 (L6+)
   L39-7 (FLI-) - L23-13 (L6-)
   L37-1 (SLD) - Body ground	Always	10 kΩ or higher
   L37-2 (FRO+) - Body ground
   L37-3 (FRO-) - Body ground
   L37-4 (FLO+) - Body ground
   L37-5 (FLO-) - Body ground
   L23-16 (R6+) - Body ground
   L23-15 (R6-) - Body ground
   L23-14 (L6+) - Body ground
   L23-13 (L6-) - Body ground
   L23-17 (SLD6) - Body ground

   Fig 2: Identifying F24 Receiver Connector And L37, L39 Tuner Connectors And L23 Selector Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next Step 

1. Replace the stereo component tuner with a normal one and check if the same problem occurs again (See REMOVAL  ).

   OK: Same problem does not occur. 

NG: REPLACE RADIO RECEIVER ASSEMBLY  (See REMOVAL  )

OK: END (STEREO COMPONENT TUNER IS DEFECTIVE) 

1. Disconnect the F24 receiver connector.
2. Disconnect the L23 selector connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   F24-2 (CDR+) - L23-16 (R6+)	Always	Below 1 Ω
   F24-3 (CDR-) - L23-15 (R6-)
   F24-4 (CDL+) - L23-14 (L6+)
   F24-5 (CDL-) - L23-13 (L6-)
   L23-13 (L6-) - Body ground	Always	10 kΩ or higher
   L23-14 (L6+) - Body ground
   L23-15 (R6-) - Body ground
   L23-16 (R6+) - Body ground
   L23-17 (SLD6) - Body ground

Fig 3: Identifying F24 Receiver Connector And L23 Selector Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE RADIO RECEIVER ASSEMBLY  (See REMOVAL  )