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Service
Manual ORDER NO.
CRT2120

LX470
AUDIO SYSTEM
POWER AMPLIFIER
VEHICLE DESTINATION PRODUCED AFTER TOYOTA PART No. ID No. PIONEER MODEL No.
LEXUS LX470 U.S.A. , CANADA January 1998 86280-60160 GM-8086ZT/UC
LEXUS LX470 U.S.A. , CANADA January 1998 86280-60160 GM-8086ZT-91/UC

Manufactured for TOYOTA
by PIONEER ELECTRONIC CORPORATION PUB. NO. CRT2120
GM-8086ZT,8086ZT-91

GM-8086ZT/UC, GM-8086ZT-91/UC

- GM-8086ZT/UC has adopted AVC-LAN.
NOTE:
- The GM-8086ZT-91/UC is supplementary genuine part for a TOYOTA vehicle, and a Pioneer product for recycling
stock.
- As for the structure and electrical system, there is no difference between the GM-8086ZT/UC and GM-8086ZT-91/UC.

- Supplementally model is identical to the original except for the addition of following items.

Description Part No.
Carton CHG3497
Contain Box CHL3497
Cover CEG1045

CONTENTS
1. SAFETY INFORMATION ............................................2 7. GENERAL INFORMATION .......................................18
2. EXPLODED VIEWS AND PARTS LIST .......................3 7.1 IC.........................................................................18
3. SCHEMATIC DIAGRAM .............................................4 7.2 DIAGNOSIS........................................................19
4. PCB CONNECTION DIAGRAM ................................10 7.2.1 DISASSEMBLY..........................................19
5. ELECTRICAL PARTS LIST ........................................14 7.2.2 CONNECTOR FUNCTION DESCRIPTION .......20
6. ADJUSTMENT..........................................................17 7.3 EXPLANATION...................................................20
7.3.1 SYSTEM BLOCK DIAGRAM.....................20
7.3.2 BLOCK DIAGRAM.....................................21
8. OPERATIONS AND SPECIFICATIONS.....................22

1. SAFETY INFORMATION
This service manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer.
Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair
complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may void the warranty.
If you are not qualified to perform the repair of this product properly and safely, you should not risk trying to do so
and refer the repair to a qualified service technician.

2
GM-8086ZT,8086ZT-91

2. EXPLODED VIEWS AND PARTS LIST
2.1 EXTERIOR

Fig. 1

NOTE:
- Parts marked by "*"are generally unavailable because they are not in our Master Spare Parts List.
- Screws adjacent to mark on the product are used for disassembly.

- EXTERIOR SECTION PARTS LIST

Mark No. Description Part No. Mark No. Description Part No.
1 Screw BMZ30P060FMC 12 Screw CBA1409
2 Screw BMZ50P080FMC 13 Connector(CN954) CKM1124
3 Screw CBA1427 14 Connector(CN951) CKM1125
4 Chassis CNA1939 15 Connector(CN952) CKM1126
5 Case CNB2298 16 Connector(CN953) CKM1127

6 Bracket CNC7181 17 Holder CNC7146
* 7 Seal CNM5381 18 Bracket CNC7147
* 8 Seal CNM5714 19 Transistor(Q903) 2SD1273
* 9 Heat Sink CNR1482 20 IC(IC601) TA8221AH1
10 Amp Unit CWM5422 21 IC(IC602) TA8221AH1

11 Screw BMZ30P060FMC 22 IC(IC603) TA8221AH1
3
1 2 3 4
GM-8086ZT,8086ZT-91

3. SCHEMATIC DIAGRAM
A
3.1 OVERALL CONNECTION DIAGRAM(GUIDE PAGE)
Note: When ordering service parts, be sure to refer to "EXPLODED VIEWS AND PARTS LIST" or "ELECTRICAL PARTS
LIST".

A-a
Large size
A-a A-b
SCH diagram

A-a A-b Guide page

B

A-a A-b Detailed page

C

D

4 A 1 2 3 4
5 6 7 8
GM-8086ZT,8086ZT-91

A

A-b
A AMP UNIT

B

C

D

Fig. 2

5 6 7
A8
5
1 2 3 4
GM-8086ZT,8086ZT-91

A-a A-b

A

B

C

D

6 A-a
1 2 3 4
5 6 7 8
GM-8086ZT,8086ZT-91

A-a A-b
A

B

C

D

Fig. 3

5 6 7
A-a
8
7
1 2 3 4
GM-8086ZT,8086ZT-91

A-a A-b

A

A AMP UNIT

B

C

D

8 A-b
1 2 3 4
5 6 7 8
GM-8086ZT,8086ZT-91

A-a A-b
A

B

C

D

Fig. 4

5 6 7
A-b8
9
1 2 3 4
GM-8086ZT,8086ZT-91

4. PCB CONNECTION DIAGRAM
A 4.1 AMP UNIT
NOTE FOR PCB DIAGRAMS
1. The parts mounted on this PCB 2. Viewpoint of PCB diagrams
include all necessary parts for
Connector Capacitor
several destination.
For further information for SIDE A
respective destinations, be sure
to check with the schematic dia-
gram. P.C.Board Chip Part SIDE B

A AMP UNIT
B

C

17 15 13 11 9 7 5 3 1
16 14 12 10 8 6 4 2

D

10 A
1 2 3 4
5 6 7 8
GM-8086ZT,8086ZT-91

A

SIDE A

B

C

17 15 13 11 9 7 5 3 1 17 15 13 11 9 7 5 3 1
16 14 12 10 8 6 4 2 16 14 12 10 8 6 4 2

D

Fig. 5

5 6 7
A
8
11
1 2 3 4
GM-8086ZT,8086ZT-91

A

A AMP UNIT

B

C

D

12 A
1 2 3 4
5 6 7 8
GM-8086ZT,8086ZT-91

A

SIDE B

B

C

Fig. 6 D

5 6 7
A8
13
GM-8086ZT,8086ZT-91

5. ELECTRICAL PARTS LIST
NOTE:
- Parts whose parts numbers are omitted are subject to being not supplied.
- The part numbers shown below indicate chip components.
Chip Resistor
RS1/_S___J,RS1/__S___J
Chip Capacitor (except for CQS.....)
CKS....., CCS....., CSZS.....

=====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No.
--- ------ ------------------------------------------ ------------------------- --- ------ ------------------------------------------ -------------------------
Unit Number : CWM5422 D 904 Diode MA141WK
A Unit Name : Amp Unit L
FU
901
901
Choke Coil 0.3mH
Fuse 8A
CTH1194
CEK1180
MISCELLANEOUS
RESISTORS
IC 401 IC NJM2068MD
IC 402 IC NJM2068MD R 401 RS1/10S472J
IC 403 IC NJM2068MD R 402 RS1/10S472J
IC 404 IC NJM2068MD R 403 RS1/10S472J
IC 501 IC NJM2068MD R 404 RS1/10S472J
R 405 RS1/10S562J
IC 502 IC NJM2068MD
IC 503 IC NJM2068MD R 406 RS1/10S562J
IC 504 IC NJM2068MD R 407 RS1/10S123J
IC 551 IC NJM2068MD R 408 RS1/10S123J
IC 552 IC NJM2068MD R 409 RS1/10S431J
R 410 RS1/10S683J
IC 601 IC TA8221AH1
IC 602 IC TA8221AH1 R 411 RS1/10S132J
IC 603 IC TA8221AH1 R 412 RS1/10S332J
IC 801 IC M51957BFP R 413 RS1/10S912J
IC 851 IC NJM2068MD R 414 RS1/10S683J
R 415 RS1/10S122J
IC 852 IC NJM2068MD
Q 401 Transistor 2SC4081LN R 416 RS1/10S332J
Q 402 Transistor 2SC4081LN R 417 RS1/10S912J
Q 403 Transistor 2SC4081LN R 418 RS1/10S753J
Q 404 Transistor 2SC4081LN R 419 RS1/10S122J
R 420 RS1/10S332J
Q 405 Transistor 2SC4081LN
Q 406 Transistor 2SC4081LN R 421 RS1/10S102J
Q 407 Transistor 2SC4081LN R 422 RS1/10S753J
Q 408 Transistor 2SC4081LN R 423 RS1/10S132J
Q 409 Transistor 2SC4081LN R 424 RS1/10S332J
R 425 RS1/10S392J
Q 410 Transistor 2SC4081LN
Q 451 Transistor 2SC4081LN R 426 RS1/10S683J
Q 452 Transistor 2SC4081LN R 427 RS1/10S122J
Q 453 Transistor 2SC4081LN R 428 RS1/10S332J
Q 454 Transistor 2SC4081LN R 429 RS1/10S431J
R 430 RS1/10S683J
Q 455 Transistor 2SC4081LN
Q 456 Transistor 2SC4081LN R 431 RS1/10S132J
Q 651 Transistor DTC323TK R 432 RS1/10S332J
Q 652 Transistor DTC323TK R 433 RS1/10S912J
Q 661 Transistor DTC323TK R 434 RS1/10S683J
R 435 RS1/10S122J
Q 662 Transistor DTC323TK
Q 671 Transistor DTC323TK R 436 RS1/10S332J
Q 802 Transistor 2SA1586 R 437 RS1/10S912J
Q 803 Transistor DTC114EU R 438 RS1/10S753J
Q 804 Transistor 2SA1586 R 439 RS1/10S122J
R 440 RS1/10S332J
Q 807 Transistor 2SA1586
Q 901 Transistor 2SA1586 R 441 RS1/10S101J
Q 902 Transistor 2SC4081 R 442 RS1/10S101J
Q 903 Transistor 2SD1273 R 443 RS1/10S102J
Q 904 Transistor 2SC4081 R 444 RS1/10S753J
R 445 RS1/10S132J
Q 951 Transistor 2SA1586
D 801 Diode MA141WK
D 901 Diode 5KP24A
D 902 Diode MA8091(M)
D 903 Diode MA8047(M)

14
GM-8086ZT,8086ZT-91

=====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No.
--- ------ ------------------------------------------ ------------------------- --- ------ ------------------------------------------ -------------------------
R 446 RS1/10S332J R 527 RN1/10SE1202D
R 447 RS1/10S392J R 528 RN1/10SE2202D
R 448 RS1/10S683J R 551 RS1/10S223J
R 449 RS1/10S122J R 552 RS1/10S223J
R 450 RS1/10S332J R 553 RS1/10S223J

R 451 RS1/10S472J R 554 RS1/10S223J
R 452 RS1/10S472J R 555 RS1/10S562J
R 453 RS1/10S472J R 556 RS1/10S822J
R 454 RS1/10S472J R 557 RS1/10S472J
R 455 RS1/10S622J R 558 RS1/10S822J

R 456 RS1/10S622J R 559 RS1/10S302J
R 457 RS1/10S103J R 560 RS1/10S513J
R 458 RS1/10S103J R 561 RS1/10S473J
R 459 RS1/10S243J R 562 RS1/10S473J
R 460 RS1/10S683J R 563 RS1/10S513J

R 461 RS1/10S122J R 564 RS1/10S101J
R 462 RS1/10S332J R 601 RS1/8S2R2J
R 463 RS1/10S0R0J R 602 RS1/8S2R2J
R 464 RS1/10S753J R 603 RS1/8S2R2J
R 465 RS1/10S122J R 604 RS1/8S2R2J

R 466 RS1/10S332J R 605 RS1/10S303J
R 467 RS1/10S302J R 606 RS1/10S303J
R 468 RS1/10S683J R 611 RS1/8S2R2J
R 469 RS1/10S122J R 612 RS1/8S2R2J
R 470 RS1/10S332J R 613 RS1/8S2R2J

R 471 RS1/10S243J R 614 RS1/8S2R2J
R 472 RS1/10S683J R 615 RS1/10S303J
R 473 RS1/10S122J R 616 RS1/10S303J
R 474 RS1/10S332J R 621 RS1/8S2R2J
R 475 RS1/10S0R0J R 622 RS1/8S2R2J

R 476 RS1/10S753J R 623 RS1/8S2R2J
R 477 RS1/10S122J R 624 RS1/8S2R2J
R 478 RS1/10S332J R 625 RS1/10S272J
R 479 RS1/10S302J R 626 RS1/10S272J
R 480 RS1/10S683J R 651 RS1/10S562J

R 481 RS1/10S122J R 652 RS1/10S562J
R 482 RS1/10S332J R 653 RS1/10S103J
R 491 RS1/10S101J R 654 RS1/10S103J
R 492 RS1/10S101J R 661 RS1/10S152J
R 501 RS1/10S473J R 662 RS1/10S152J

R 502 RS1/10S473J R 663 RS1/10S103J
R 503 RS1/10S473J R 664 RS1/10S103J
R 504 RS1/10S473J R 671 RS1/10S222J
R 505 RN1/10SE5602D R 672 RS1/10S103J
R 506 RN1/10SE5602D R 801 RS1/10S332J

R 507 RN1/10SE5602D R 802 RS1/10S683J
R 508 RN1/10SE5602D R 803 RS1/10S103J
R 509 RN1/10SE7501D R 804 RS1/10S103J
R 510 RN1/10SE2202D R 806 RS1/10S103J
R 511 RN1/10SE1202D R 807 RS1/10S103J

R 512 RN1/10SE2202D R 808 RS1/10S472J
R 513 RN1/10SE5602D R 809 RS1/10S222J
R 514 RN1/10SE5602D R 810 RS1/4S222J
R 515 RN1/10SE5602D R 811 RS1/10S103J
R 516 RN1/10SE5602D R 812 RS1/10S472J

R 517 RN1/10SE7502D R 821 RS1/10S184J
R 518 RN1/10SE1102D R 822 RS1/10S303J
R 519 RN1/10SE8202D R 851 RS1/8S222J
R 520 RN1/10SE1102D R 852 RS1/8S222J
R 521 RN1/10SE4702D R 853 RS1/8S222J

R 522 RN1/10SE8202D R 854 RS1/8S222J
R 523 RN1/10SE3002D R 855 RS1/10S333J
R 524 RN1/10SE8202D R 856 RS1/10S333J
R 525 RN1/10SE7501D R 857 RS1/10S333J
R 526 RN1/10SE2202D R 858 RS1/10S333J

15
GM-8086ZT,8086ZT-91

=====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No.
--- ------ ------------------------------------------ ------------------------- --- ------ ------------------------------------------ -------------------------
R 859 RS1/10S273J C 460 CKLSB183K50
R 860 RS1/10S273J C 461 CKLSB183K50
R 861 RS1/10S273J C 462 CKLSQB822K50
R 862 RS1/10S273J C 463 CKSYB123K50
R 863 RS1/8S222J C 464 CKLSB333K50

R 864 RS1/8S222J C 465 CKSYB684K16
R 865 RS1/8S222J C 466 CKLSB183K50
R 866 RS1/8S222J C 467 CKLSB183K50
R 867 RS1/10S333J C 468 CKLSQB822K50
R 868 RS1/10S333J C 501 CKLSQB272K50

R 869 RS1/10S333J C 502 CKLSQB822K50
R 870 RS1/10S333J C 503 CKLSQB272K50
R 871 RS1/10S273J C 504 CKLSQB822K50
R 872 RS1/10S273J C 505 CKLSR104K16
R 873 RS1/10S273J C 506 CKLSR473K16

R 874 RS1/10S273J C 507 CKLSR104K16
R 901 RS1/8S153J C 508 CKLSR473K16
R 903 RS1/10S472J C 509 CCSQCH680J50
R 904 RS1/10S392J C 510 CCSQCH330J50
R 905 RS1/10S392J C 511 CCSQCH560J50

R 906 RS1/4S751J C 512 CCSQCH330J50
R 907 RS1/10S102J C 551 CKSQYB332K50
R 908 RS1/4S1R5J C 552 CFTNA564J50
R 909 RS1/10S102J C 553 CFTNA564J50
R 951 RS1/10S103J C 554 CFTNA564J50

R 952 RS1/8S153J C 555 CKLSR563K16
R 954 RS1/10S472J C 556 CKSYB394K16
R 955 RS1/10S103J C 557 CKLSQB272K50
R 957 RS1/10S104J C 601 CEANL4R7M25
R 958 RS1/10S104J C 602 CEANL4R7M25

R 959 RS1/10S331J C 603 CEAS221M16
C 604 CKSQYB102K50
CAPACITORS C 605 CKSYB224K16
C 606 CKSYB224K16
C 401 CCSQCH221J50 C 607 CKSYB224K16
C 402 CCSQCH221J50
C 403 CKSQYB334K16 C 608 CKSYB224K16
C 404 CKSQYB334K16 C 609 CKSQYB102K50
C 405 CKSQYB334K16 C 610 CEAS331M16
C 611 CEANL4R7M25
C 406 CKSQYB334K16 C 612 CEANL4R7M25
C 407 CKSYB684K16
C 408 CKLSR563K16 C 613 CEAS221M16
C 409 CKLSR563K16 C 614 CKSQYB102K50
C 410 CKLSB183K50 C 615 CKSYB224K16
C 616 CKSYB224K16
C 411 CKLSQB682K50 C 617 CKSYB224K16
C 412 CCSQCH681J50
C 413 CKSQYB124K16 C 618 CKSYB224K16
C 414 CKSQYB154K16 C 619 CKSQYB102K50
C 415 CKLSQB822K50 C 620 CEAS331M16
C 621 CEANL4R7M25
C 416 CKLSB223K50 C 622 CEANL4R7M25
C 417 CKSYB684K16
C 418 CKLSR563K16 C 623 CEAS221M16
C 419 CKLSR563K16 C 624 CKSQYB102K50
C 420 CKLSB183K50 C 625 CKSYB224K16
C 626 CKSYB224K16
C 421 CKLSQB682K50 C 627 CKSYB224K16
C 422 CCSQCH681J50
C 423 CKSQYB124K16 C 628 CKSYB224K16
C 424 CKSQYB154K16 C 629 CKSQYB102K50
C 425 CKLSQB822K50 C 630 CEAS331M16
C 651 CEAS100M16
C 426 CKLSB223K50 C 652 CEAS100M16
C 451 CCSQCH221J50
C 452 CCSQCH221J50 C 653 CEANLR47M50
C 453 CKSQYB334K16 C 654 CEANLR47M50
C 454 CKSQYB334K16 C 661 CEAS100M16
C 662 CEAS100M16
C 455 CKSQYB334K16 C 663 CEANLR47M50
C 456 CKSQYB334K16
C 457 CKSYB123K50
C 458 CKLSB333K50
C 459 CKSYB684K16

16
GM-8086ZT,8086ZT-91

=====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No.
--- ------ ------------------------------------------ ------------------------- --- ------ ------------------------------------------ -------------------------
C 664 CEANLR47M50 C 888 CCSQCH331J50
C 671 CEAS100M16 C 901 CEAS472M16
C 672 CEANLR47M50 C 902 CKSQYB104K50
C 673 CEANLR47M50 C 903 CKSQYB473K50
C 801 CEAS1R0M50 C 904 470