Pinout Values and Diagnostic Parameters

AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: TERMINALS OF ECU

TERMINALS OF ECU

1. CHECK MULTI-DISPLAY





(a) Disconnect the K46 display connector.
(b) Measure the resistance and voltage of the wire harness side connector.





- If the result is not as specified, there may be a malfunction on the wire harness side.

(c) Reconnect the K46 display connector.
(d) Measure the voltage of the connector.





HINT:
*1: for DVD Changer Models
*2: w/o LEXUS Link System
- If the result is not as specified, the multi-display may have a malfunction.

2. CHECK RADIO RECEIVER





(a) Disconnect the K54 receiver connector.
(b) Measure the voltage of the wire harness side connector.





- If the result is not as specified, there may be a malfunction on the wire harness side.

(c) Reconnect the K54 receiver connector.
(d) Measure the voltage on the connectors.









HINT:
*1: for DVD changer models
*2: For models with a DVD changer, the radio receiver assembly consists of a sub wire harness and radio receiver. The sub wire harness is supplied as part of the radio receiver assembly.
- If the result is not as specified, the receiver may have a malfunction.





(e) Using an oscilloscope, check the waveform.






3. CHECK STEREO COMPONENT AMPLIFIER (for CD Changer Models)





(a) Disconnect the U29 and U42 amplifier connectors.
(b) Measure the voltage of the connectors.





- If the result is not as specified, there may be a malfunction on the wire harness.

(c) Reconnect the U29 and U42 amplifier connectors.
(d) Measure the voltage of the connectors.





HINT: *1: w/ LEXUS Link System
- If the result is not as specified, the amplifier may have a malfunction.

4. CHECK STEREO COMPONENT AMPLIFIER (for DVD Changer Models)





(a) Disconnect the U31 amplifier connector.
(b) Measure the voltage of the connector.





- If the result is not as specified, there may be a malfunction on the wire harness.

(c) Reconnect the U31 amplifier connector.
(d) Measure the voltage of the connectors.









HINT: *1: w/ LEXUS Link System
- If the result is not as specified, the amplifier may have a malfunction.

5. CHECK NETWORK GATEWAY ECU





(a) Measure the voltage of the connector.






6. CHECK MAYDAY ECU Pinout Values and Diagnostic Parameters