Audio System - Diagnosis: Wiring Lexus SC II

WIRING DIAGRAM

See ALTHOUGH "POWER" IS PRESSED, NO SOUND IS HEARD (DISPLAY IS NORMAL, BUT SWITCH OPERATION DOES NOT FUNCTION) .

Scheme 43

Scheme 44

1. SERVICE CHECK MODE (GATEWAY ECU) Service check Activate the diagnosis system and read out the check results in the service check mode. Standard: "NCON (No Connection)" or nothing displayed NG: Go to step 3 OK: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSY - GATEWAY ECU) Disconnect the radio receiver assy and gateway ECU. Check continuity of wire harness. Standard: TERMINAL SPECIFICATION Terminal Condition Specified condition TX+-GTX+ Constant Continuity TX-GTX- Constant Continuity TXS+ - Body ground Constant No continuity TXS-Body ground Constant No continuity RADIO RECEIVER ASSY GATEWAY ECU NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) OK: CHECK AND REPLACE COMPUTER, NETWORK GATEWAY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) )
3. PERFORM ACTIVE TEST BY LEXUS HAND-HELD TESTER (STEERING PAD SWITCH) Connect the hand-held tester to the DLC3. Check steering pad switch using DATA LIST. Audio control switch TESTER SPECIFICATION Switch name (Tester display) No pressing Pressing Mode switch (AV MODE SW) OFF ON NG: CHECK SWITCH AND REPLACE STEERING PAD MODULATOR (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) OK: CHECK AND REPLACE COMPUTER, NETWORK GATEWAY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) )

See ALTHOUGH "POWER" IS PRESSED, NO SOUND IS HEARD (DISPLAY AND SWITCH OPERATION IS NORMAL) .

Scheme 45

Scheme 46

1. INSPECT STEREO COMPONENT SPEAKER ASSY (FRONT SPEAKER) Preparation for Check Disconnect the connector of the front speaker. Resistance Check Check the resistance between the terminals of the front speaker. NOTE: The speaker should not be removed for checking. Standard value: 2-9 ohms NG: REPLACE STEREO COMPONENT SPEAKER ASSY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) OK: GO TO NEXT STEP
2. INSPECT REAR SPEAKER ASSY (REAR SPEAKER) Preparation for Check Disconnect the connector of the rear speaker. Resistance Check Check the resistance between the terminals of the rear speaker. NOTE: The speaker should not be removed for checking. Standard value: 2-9 ohms NG: REPLACE REAR SPEAKER ASSY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) OK: GO TO NEXT STEP
3. INSPECT REAR SPEAKER ASSY NO. 2 (WOOFER) Preparation for Check Disconnect the connector of the woofer. Resistance Check Check the resistance between the terminals of the woofer. NOTE: The speaker should not be removed for checking. Standard value: 14.5 ohms NG: REPLACE REAR SPEAKER ASSY NO. 2 (See «REAR SPEAKER ASSY NO. 2»(ref-234323-S00530390122006060800000) ) OK: GO TO NEXT STEP
4. INSPECT FRONT NO. 1 SPEAKER ASSY (TWEETER) Check that malfunction disappear when a known good speaker is installed. Operate again with a good front speaker assy No.1. OK: Return to normal HINT: Operate again with connectors of all speakers connected. When there is a possibility that either right or left front speaker is detective, inspect by interchanging the right one and the left one. NG: REPLACE FRONT NO. 1 SPEAKER ASSY (See ) OK: GO TO NEXT STEP
5. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSY - SPEAKER) Check the voltage between terminals under each condition, as shown in the chart. Standard: TESTER SPECIFICATION Testerconnection Condition Specified condition FR+ - Body ground Constant No continuity FL+-Body ground Constant No continuity FR-Body ground Constant No continuity FL-Body ground Constant No continuity RR+-Body ground Constant No continuity RL+-Body ground Constant No continuity RR--Body ground Constant No continuity RL-Body ground Constant No continuity WFR+ - Body ground Constant No continuity WFR-Body ground Constant No continuity WFL+ - Body ground Constant No continuity WFL- - Body ground Constant No continuity HINT: w/ LEXUS LINK SYSTEM (See «PROBLEM SYMPTOMS TABLE»(ref-211335-S25898775862005121700000) ) w/ LEXUS NAVIGATION SYSTEM (See «PROBLEM SYMPTOMS TABLE»(ref-211333-S01860924352005121700000) ) STEREO COMPONENT AMPLIFIER ASSY NG: CHECK AND REPLACE HARNESS AND CONNECTOR (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) OK: CHECK AND REPLACE STEREO COMPONENT AMPLIFIER ASSY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) )

See ALTHOUGH "POWER" IS PRESSED, NO SOUND IS HEARD (DISPLAY AND SWITCH OPERATION IS NORMAL) .

Scheme 47

Scheme 48

1. INSPECT RADIO RECEIVER ASSY (R+,R-,L+,L-) Check the voltage between terminals under each condition, as shown in the chart. Standard: TESTER SPECIFICATION Tester connection Condition Specified condition R+-GND Audio system is sounding A waveform synchronized with sounds is output R-GND Audio system is sounding A waveform synchronized with sounds is output L+-GND Audio system is sounding A waveform synchronized with sounds is output L-GND Audio system is sounding A waveform synchronized with sounds is output RADIO RECEIVER ASSY NG: CHECK AND REPLACE RADIO RECEIVER ASSY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) OK: GO TO NEXT STEP
2. INSPECT STEREO COMPONENT AMPLIFIER ASSY (R+,R-,L+,L-) Check the voltage between terminals under each condition, as shown in the chart. Standard: TESTER SPECIFICATION Tester connection Condition Specified condition R+-E Audio system is sounding A waveform synchronized with sounds is output R--E Audio system is sounding A waveform synchronized with sounds is output L+-E Audio system is sounding A waveform synchronized with sounds is output L-E Audio system is sounding A waveform synchronized with sounds is output STEREO COMPONENT AMPLIFIER ASSY NG: CHECK AND REPLACE HARNESS AND CONNECTOR (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) OK: CHECK AND REPLACE STEREO COMPONENT AMPLIFIER ASSY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) )

See ALTHOUGH "POWER" IS PRESSED, NO SOUND IS HEARD (NOTHING IS SHOWN ON DISPLAY) .

Scheme 49

1. CHECK FOR ANY FOREIGN OBJECT Check for any foreign object. Check that no foreign object or defect is detected in the cassette tape player of radio receiver assy. Standard: No foreign object and defect detected. NG: REMOVE FOREIGN OBJECT OK: GO TO NEXT STEP
2. CHECK CASSETTE TAPE Check the cassette tape. Check that the cassette tape is a normal tape to which music or voice is recorded. Standard: proper cassette tape to which music or voice is recorded. NG: CASSETTE TAPE FAULTY OK: GO TO NEXT STEP
3. REPLACE CASSETTE TAPE WITH ANOTHER AND RECHECK Replace the cassette tape with another and recheck. Replace the faulty cassette tape with the normal one to see if the same trouble occurs again. Standard: The function is recovered to be normal. NG: CASSETTE TAPE FAULTY OK: GO TO NEXT STEP
4. CHECK IF RADIO AUTO-SEARCH FUNCTIONS PROPERLY Check if the radio auto-search functions properly. Perform the auto-search of the radio and check that the operation is normal. Standard: The operation returns to be normal. OK: CHECK AND REPLACE RADIO RECEIVER ASSY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) NG: GO TO NEXT STEP
5. INSPECT RADIO RECEIVER ASSY (+B,ACC,GND) Check the continuity between terminals under each condition, as shown in the chart. Standard: TESTER SPECIFICATION Tester connection Condition Specified condition GND - Body ground Constant Continuity Check the voltage between terminals under each condition, as shown in the chart. Standard: TESTER SPECIFICATION Tester connection Condition Specified condition B-GND Constant 10 - 14 V ACC - GND Ignition switch ACC or ON 10 - 14 V RADIO RECEIVER ASSY OK: CHECK AND REPLACE RADIO RECEIVER ASSY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) )

See ALTHOUGH "POWER" IS PRESSED, NO SOUND IS HEARD (NOTHING IS SHOWN ON DISPLAY) .

Scheme 50

1. CHECK IF RADIO AUTO-SEARCH FUNCTIONS PROPERLY Check if the radio auto-search functions properly. Perform the auto-search of the radio and check that the operation is normal. Standard: The operation returns to be normal. NG: Go to step 5 OK: GO TO NEXT STEP
2. PRESS "EJECT" AND CHECK OPERATION Press "EJECT" and check the operation. Press the cassette tape EJECT switch of the radio receiver assembly for 2 sec. or more and check that the cassette tape is ejected. Standard: The cassette tape is ejected. NG: CHECK AND REPLACE RADIO RECEIVER ASSY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) OK: GO TO NEXT STEP
3. CHECK CASSETTE TAPE Check the cassette tape. Check that the ejected cassette tape for peeled label, deformation or any other defects. Standard: No defect in the cassette tape. NG: CASSETTE TAPE FAULTY OK: GO TO NEXT STEP
4. REPLACE CASSETTE TAPE WITH ANOTHER AND RECHECK Replace the cassette tape with another and recheck. Replace the faulty cassette tape with normal one to see if the same trouble occurs again. Standard: The operation returns to be normal. OK: CASSETTE TAPE FAULTY NG: GO TO NEXT STEP
5. INSPECT RADIO RECEIVER ASSY (+B,ACC,GSSfD) Check the continuity between terminals under each condition, as shown in the chart. Standard: TESTER SPECIFICATION Tester connection Condition Specified condition GND - Body ground Constant Continuity Check that the voltage between terminals at each condition, as shown in the chart. Standard: TESTER SPECIFICATION Tester connection Condition Specified condition B - GND Constant 10 - 14 V ACC - GND Ignition switch ACC or ON 10 - 14 V RADIO RECEIVER ASSY OK: CHECK AND REPLACE RADIO RECEIVER ASSY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) )

See ALTHOUGH "POWER" IS PRESSED, NO SOUND IS HEARD (NOTHING IS SHOWN ON DISPLAY) .

Scheme 51

1. CHECK IF A PROPER CD IS INSERTED Check that a proper CD is inserted. Make sure that the CD is a normal music CD, and that there is no deformation, flaw, stain, burr and other defects on the CD. Standard: Normal music CD. Reference: Translucent or different-shaped CD cannot be played. CD-ROM for personal computers (with music recorded in) and recorded CD -R may not be played. Playing an 8-cm CD does not require an adapter. NG: CD FAULTY OK: GO TO NEXT STEP
2. CHECK SETTING OF CD Check setting of CD. Check whether or not the CD is inserted upside down. Standard: Not upside down. NG: SET DISC CORRECTLY OK: GO TO NEXT STEP
3. REPLACE CD WITH ANOTHER AND RECHECK Replace the CD with another and recheck. Replace the faulty CD with normal one to see if the same trouble occurs again. Standard: The operation returns to be normal. OK: CD FAULTY NG: GO TO NEXT STEP
4. CHECK IF RADIO AUTO-SEARCH FUNCTIONS PROPERLY Check if the radio auto-search functions properly. Perform the auto-search of the radio and check that the operation is normal. Standard: The operation returns to be normal. NG: Go to step 6 OK: GO TO NEXT STEP
5. DID THE TEMPERATURE IN THE CABIN CHANGE RAPIDLY? Did the temperature in the cabin change rapidly? Check whether or not the rapid temperature change occurred in the cabin. Cause: Rapid temp, change. Reference: Rapid temperature change may cause condensation inside the CD player, which may affect its normal operation. OK: CONDENSATION DUE TO TEMPERATURE CHANGE (LEAVE IT AS ST IS FOR A WHILE BEFORE USING) NG: CHECK AND REPLACE RADIO RECEIVER ASSY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) )
6. INSPECT RADIO RECEIVER ASSY Check the continuity between terminals under each condition, as shown in the chart. Standard: TESTER SPECIFICATION Tester connection Condition Specified condition GND - Body ground Constant Continuity Check the voltage between terminals under each condition, as shown in the chart. Standard: TESTER SPECIFICATION Tester connection Condition Specified condition B-GND Constant 10 - 14 V ACC-GND Ignition switch ACC or ON 10 - 14 V RADIO RECEIVER ASSY (6 speaker system) OK: CHECK AND REPLACE RADIO RECEIVER ASSY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) )

See ALTHOUGH "POWER" IS PRESSED, NO SOUND IS HEARD (NOTHING IS SHOWN ON DISPLAY) .

Scheme 52

1. CHECK IF RADIO AUTO-SEARCH FUNCTIONS PROPERLY Check if the radio auto-search functions properly. Perform the auto-search of the radio and check that the operation is normal. Standard: The operation returns to be normal. NG: Go to step 5 OK: GO TO NEXT STEP
2. PRESS "EJECT" AND CHECK OPERATION Press "EJECT" and check the operation. Press the CD EJECT switch of the radio receiver assembly for 2 sec. or more to see if the CD is ejected. Standard: CD is elected HINT: If the CD is not ejected, send the vehicle for repair. Do not try to tap and draw it out by force. NG: CHECK AND REPLACE RADIO RECEIVER ASSY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) OK: GO TO NEXT STEP
3. CHECK IF A PROPER CD IS INSERTED Check that a proper CD is inserted. Make sure that the CD is a normal music CD, and that there is no deformation, flaw, stain, burr and other defects on the CD. Standard: Normal music CD. HINT: Translucent or different-shaped CD cannot be played. CD-ROM for personal computers (with music recorded in) and recorded CD-R may not be played. Playing an 8-cm CD does not require an adapter. NG: CD FAULTY OK: GO TO NEXT STEP
4. REPLACE CD WITH ANOTHER AND RECHECK Replace the CD with another and recheck. Replace the faulty CD with normal one to see if the same trouble occurs again. Standard: The operation returns to be normal. OK: CD FAULTY NG: GO TO NEXT STEP
5. INSPECT RADIO RECEIVER ASSY (+B,ACC,GND) Check the continuity between terminals under each condition, as shown in the chart. Standard: TESTER SPECIFICATION Tester connection Condition Specified condition GND - Body ground Constant Continuity Check the voltage between terminals under each condition, as shown in the chart. Standard: TESTER SPECIFICATION Tester connection Condition Specified condition B - GND Constant 10 - 14 V ACC - GND Ignition switch ACC or ON 10 - 14 V RADIO RECEIVER ASSY (6 speaker system) OK: CHECK AND REPLACE RADIO RECEIVER ASSY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) )

See ILLUMINATION CIRCUIT .

Scheme 53

1. INSPECT RADIO RECEIVER ASSY(ILL+,ILL-) Check the voltage between terminals under each condition, as shown in the chart. Standard: TESTER SPECIFICATION Tester connection Condition Specified condition ILL+-GND Light control switch TAIL or HEAD 10 - 14 V ILL-GND Light control switch TAIL or HEAD Below 1 V RADIO RECEIVER ASSY OK: CHECK AND REPLACE RADIO RECEIVER ASSY (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-211244-S04858577852005121700000) )

See ILLUMINATION CIRCUIT