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ORDER NO.
CRT2252
PUB. NO.
CRT2252
AUDIO SYSTEM
HEAD UNIT
Manufactured for TOYOTA
by PIONEER ELECTRONIC CORPORATION
ES300
Service
Manual
VEHICLE
DESTINATION
PRODUCED AFTER
ID No.
TOYOTA PART No.
PIONEER MODEL No.
LEXUS ES300
MIDDLE EAST
December 1998
P7510
86120-33230
KEX-M8186ZT/ES
KEX-M8186ZT-91/ES


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KEX-M8186ZT,M8186ZT-91
- Dolby noise reduction manufactured under license from Dolby Laboratories Licensing Corporation.
"Dolby" and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation.
- See the separate manual CX-529 (CRT1507) for the cassette mechanism description.
- The cassette mechanism employed in this model is one of 2L mechanism description.
P7510
NOTE:
- The KEX-M8186ZT-91/ES 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 KEX-M8186ZT/ES and
KEX-M8186ZT-91/ES.
- Supplementary model is identical to the original except for the addition of following items.
Description
Part No.
Polyethylene Bag
CEG1026
Carton
CHA2025
Contain Box
CHD2025
Protector
CHP1888,1889
CONTENTS
1. SAFETY INFORMATION ............................................3
2. EXPLODED VIEWS AND PARTS LIST .......................4
3. SCHEMATIC DIAGRAM .............................................8
4. PCB CONNECTION DIAGRAM ................................24
5. ELECTRICAL PARTS LIST ........................................38
6. ADJUSTMENT..........................................................46
7. GENERAL INFORMATION .......................................51
7.1 PARTS ................................................................51
7.1.1 IC ..............................................................51
7.1.2 DISPLAY...................................................53
7.2 DIAGNOSIS .......................................................54
7.2.1 DIAGNOSIS MODE .................................54
7.2.2 DISASSEMBLY ........................................58
7.2.3 CONNECTOR FUNCTION DESCRIPTION ..59
7.3 BLOCK DIAGRAM .............................................60
8. OPERATIONS AND SPECIFICATIONS.....................62


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KEX-M8186ZT,M8186ZT-91
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.


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4
KEX-M8186ZT,M8186ZT-91
2. EXPLODED VIEWS AND PARTS LIST
2.1 EXTERIOR


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KEX-M8186ZT,M8186ZT-91
Mark No. Description
Part No.
Mark No. Description
Part No.
- EXTERIOR SECTION PARTS LIST
1 Screw
BMZ26P050FMC
2 Screw
BMZ30P050FMC
3 Case
CNB1980
4 Insulator
CNM4472
5 Spacer
CNM4564
6 Main Unit
CWM6017
7 Chassis Unit
CXB1275
8 Cassette Mechanism ModuleEXK3045
9 Screw
IMS30P050FMC
10 Spacer
CNM5593
11 Screw
BMZ30P060FMC
12 Screw
CBA1339
13 Connector(CN703)
CDE4737
14 Connector(CN852)
CKM1074
15 Plug(CN851)
CKM1221
16 Connector(CN402)
CKS2826
17 Connector(CN401)
CKS2628
18 Connector(CN652,653)
CKS3008
19 Plug(CN701,702)
CKS3156
20 Antenna Jack(CN651)
CKX1024
21 Holder
CNC2218
22 Holder
CNC4981
23 Holder
CNC6057
24 Holder
CNC6058
25 MW/SW Unit
CWA1077
26 FM Unit
CWE1345
27 Screw
BPZ26P100FMC
28 Button(TUNE,SEEK)
CAC4438
29 Button(EJECT)
CAC4583
30 Button(1,2)
CAC4736
31 Button(3,4)
CAC4737
32 Button(5,6)
CAC4738
33 Button(SCAN,P.SCAN)
CAC4739
34 Button(AM/SW)
CAC5746
35 Button(FM)
CAC5747
36 Button(TAPE)
CAC4742
37 Button(CD)
CAC4743
38 Holder
CNV3645
39 Holder
CNV3646
40 Holder
CNV3647
41 Holder
CNV3648
42 LCD Unit
CWM6019
43 Keyboard Unit
CWM6018
44 Knob Unit
CXB4042
45 Spring
CBL-108
46 Knob Unit
CXB4043
47 Spring
CBL-108
48 Grille Unit
CXB2863
49 Door
CAT1980
50 Spring
CBH1371
51 Plug(CN202)
CKS1607
52 Plug(CN201)
CKS1615
53 Holder
CNC5060
54 Plug(CN2)
CKS1607
55 Plug(CN1)
CKS1616
56 Holder
CNC4666
57 Holder
CNC7007
58 FM Front End
CWB1070
59 Screw
BPZ20P060FMC
60 LCD
CAW1494
61 Plug(CN903)
CKS2706
62 Holder
CNC5182
63 PCB
CNP4104
64 Holder
CNV4343
65 Nut
CBN1008
66 Connector(CN901,902)
CKS2646
67 Connector(CN905)
CKS2827
68 Connector(CN904)
CKS2835
69 Holder
CNC6068
70 Rubber
CNV3649
71 Rubber
CNV3650
72 Rubber
CNV4324
73 IC(IC951)
TA8214K
74 Transistor(Q958,959)
2SB1335A
75 Volume(VR901-905)
CCS1119
76 Volume(S901)
CCS1106
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.