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Service
Manual ORDER NO.
CRT2498


LX470
AUDIO SYSTEM
POWER AMPLIFIER

VEHICLE DESTINATION PRODUCED AFTER TOYOTA PART No. ID No. PIONEER MODEL No.
LEXUS LX470 U.S.A August 2000 86280-60250 GM-8406ZT/UC
Canada GM-8406ZT-91/UC




Manufactured for TOYOTA
by PIONEER CORPORATION PUB. NO. CRT2498
GM-8406ZT,8406ZT-91




NOTE:
- The GM-8406ZT-91/UC is supplementally 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-8406ZT-91/UC and GM-8406ZT/UC.
- Supplementally model is identical to the original except for the addition of following items.
*:Non spare part
Part No.
Description GM-8406ZT-91/UC
Cover CEG1057
Protector CHP2329
Protector CHP2330
Carton CHG4144
Contain Box CHL4145
- When diagnosing a product, take care of its heated portion.
Power IC (IC801,802,803)
Power Supply IC (IC901,902)
DSP IC (IC201,251)
Heat Sink
IC Holder



CONTENTS
1. SAFETY INFORMATION............................................2 7. GENERAL INFORMATION.......................................28
2. EXPLODED VIEWS AND PARTS LIST ......................3 7.1 DIAGNOSIS .......................................................28
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM ....5 7.1.1 DISASSEMBLY.........................................28
4. PCB CONNECTION DIAGRAM................................12 7.1.2 CONNECTOR FUNCTION DESCRIPTION ......30
5. ELECTRICAL PARTS LIST........................................20 7.2 IC ........................................................................31
6. ADJUSTMENT .........................................................24 7.3 EXPLANATION...................................................34
7.3.1 OPERATIONAL FLOW CHART .................34
7.3.2 SYSTEM BLOCK DIAGRAM.....................36
8. SPECIFICATIONS .....................................................37



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-8406ZT,8406ZT-91



2. EXPLODED VIEWS AND PARTS LIST
2.1 EXTERIOR




3
GM-8406ZT,8406ZT-91



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 Plug(CN906) CKS4240 16 Cushion CNM7009
2 Plug(CN905) CKS4242 17 Heat Sink CNR1566
3 Screw BMZ30P200FMC 18 Amp Unit CWM7110
4 Screw BMZ50P060FMC 19 Screw BPZ30P060FSN
5 Screw BSZ26P060FMC 20 Screw BSZ26P060FMC

6 Screw BSZ30P060FMC 21 Connector(CN902) CKM1308
7 Screw BSZ30P100FMC 22 Connector(CN901) CKM1310
8 Chassis CNA2142 23 Holder CNC8187
9 Case CNB2563 24 Bracket CNC8681
10 Shield Case CNC8185 25 Sheet CNM7015

11 Shield Case CNC8186 26 DSP Unit CWM7111
12 Bracket CNC8920 27 Socket(CN102) CKS3632
13 Bracket CNC8919 28 Socket(CN101) CKS4241
14 Insulator CNM6145 29 Spacer CNV6284
15 Seal CNM6686 30 IC(IC902) BA178M05T

31 Microphone(MIC401) CPM1011
32 IC(IC801,802,803) PAL006A
33 Seal CNM7170




4
1 2 3 4
GM-8406ZT,8406ZT-91



3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM
3.1 BLOCK DIAGRAM A


A DSP UNIT B AMP UNIT
VCC VCC CN102 CN905
CRYSTAL FRONT-L
OSCILLATOR 8 FRONT
8 OPE AMP POWER AMP
2 2 9
1 IC231 1 IC241 D FLO FLIN IC701 11 IC801 (FLP)
CK L901
TC7WU04F TC7W74FU 3 13 13 3 NJM2068MD 1 10 PAL006A 7
q (FLM) BU1
7 3 PEE 2 6 4 22 25 Q801
P
SYS4 STBY1 MPUT CN901
Q831
REAR-L REAR B.U
FRONT DAC FRONT LPF OPE AMP POWER AMP
7 (RLM)
5 XTI IC261 IC702 9 WFL- WFL+
IC311 1 11 IC802 17
(RLP)
8 AK4321VF
AOUTL
2 NJM2068MD RLO
11 11 RLIN NJM2068MD 1 10 PAL006A 19
SDATA 18 ELECTRONIC 3
6 4 22 25
VOLUME




(TWLM)

(TWLP)
22
(256FS)




A/D 3
IN1 OUT1 SYS4 Q802
(FDATA)




IC351 OUT3 20 STBY1 MPUT
IC181 DSP 5 IN3 Q832 RL- RL+
AK5351VF 7 IN5 PM0017AM OUT5 18 SUB WOOFER SUB WOOFER
7 21 IC201 OPE AMP POWER AMP
AINL- 18 REAR DAC REAR LPF
SDATA SDI1 PD2061A 7
6 AINL+ 19 SDI0 5 IC703 11 IC803 FL- FL+
XTI IC281 WFO
AK4321VF
IC331 1
9 9 WFIN NJM2068MD 1 10 PAL006A 9
2 2
SDO2
SDO0




16 8 AOUTL NJM2068MD
SDO1 (RDATA) SDATA 18 4 22 25 Q803
6
17 16
MPUT
SYS4 Q833 STBY1
A OUTPUT
CONNECTOR
19 18 16 Q950
WOOFER DAC WOOFER LPF
SDI0

SDI1




SDO1




5 XTI IC291 (FSW)
IC341 7 B C
AK4321VF 5 (SPD)
15 8 AOUTL NJM2068MD
SDO2 (WDATA) SDATA AOUTR 18 INPUT
DSP 17 CONNECTOR
IC251
PD2061A
B
Q291 SPDO SPD
AUDIO INPUT L- L+




(TWLP)
BUFFER
1 2 MUTE
5 5 IC501 (H/U MUT) N-MU
7 6
6 6 NJM2068MD
ACC
5V REGULATOR
Q903




(TWLM)
BU1
68
VDD
VDD5
3 16
VDD5 CN902
TMUT
DSPERR




PEE P Q915 FL- FL+
21 PEE
PEE 11 8
SYSTEM MUTE
Q175
31 MUTI MUTIN
SMUTEIN 13 6
ACC SENSE
Q155
17 ACC1 ACC1
ASENS 6 13
BACK UP SENSE
Q151
BU1
16 BU1
7 12
IC101 BSENS
Q171
PD5585A RESET
2 NMUT1 NMUT
9 1 IC131 12 7
RESET S-80730ANDT NAVI/MUTE

79
NAVIMUTE

BUS DRIVER
22 2
SYSTEM CONTROLLER AVCIN
15 4
23 1 IC141 7
AVCOUT HA12187FP MUTE
14 5 Q910
20 8
AVCPW PMUT Q912
15
SPEED
1 MUTO MUTEO
MUTE 9 10
SYSPW1
ASLIN1




Q909
ASLIN2




Q911
XOUT




PWSENS 65 FS FS
XIN




5 14
10 12 74 76 66
Q913 B
Q101
(FSW)
C
MUTE A
/STBY 6
(ASL2)
(ASL1)




7 2
IC903
M51957BFP


SYSA5 SYSTEM
AVDD 17 2 5V REGULATOR POWER SWITCH
7
ASL Q904
5 8 SYSD5 SYS5 1 IC902 3
IC402 DVDD 18 1 BU1
NJM2068MD BA178M05T

MIC401 VR401 STBY1
Q401 1 8V REGULATOR
3 8 SYS8 1 IC901 Q906
MIC IC401
NJM2068MD 16 3 SYS8 3
NJM2930F08K
SYS4


Q161
SYSP1 SYSPW1 SYSPW1
8 11
VDD
Q907
C

SPD1 SPD1
10 9
SPEED SENSOR PULSE


CN101 CN906




D




5
1 2 3 4
1 2 3 4
GM-8406ZT,8406ZT-91


3.2 SCHEMATIC DIAGRAM
Note: When ordering service parts, be sure to refer to "EXPLODED VIEWS AND PARTS LIST" or "ELECTRICAL
PARTS LIST".
A
A-a
Large size
A-a A-b
SCH diagram




A-a A-b Guide page




A-a A-b Detailed page




B
180
6R8K




SYSTEM POWER




C
TAPE:-7.0dBs




270
4R7K




TAPE:-2.6dBs




270
4R7K




D

270
4R7K




6 A B
1 2 3 4
5 6 7 8
GM-8406ZT,8406ZT-91




A-b A



A DSP UNIT




TAPE:-3.4dBs




TAPE:-15.5dBs


TAPE:-8.4dBs

B




C



OUTPUT OFFSET
INDICATOR




TAPE:+1.2dBs
CD:+8.2dBs
TUNER: -13dBs
SPEED SENSOR PULSE
33K




2R7K
4R7/50

33K




OUTPUT OFFSET
INDICATOR




OUTPUT OFFSET
INDICATOR TAPE:+23.4dBs
CD:+30.4dBs D
TUNER:+9.4dBs
NOTE :
OUTPUT OFFSET
INDICATOR Symbol indicates a resistor. Decimal points for resistor
No differentiation is made between chip resistors and and capacitor fixed values
discrete resistors. are expressed as :
Symbol indicates a capacitor. 2.2 2R2
UDZS7R5(B)




0.022 R022
2R7K
No differentiation is made between chip capacitors and
discrete capacitors.
1R8K
18K
CRANKING
PREVENTION CIRCUIT B AMP UNIT




5 6 7
A B 8
7
1 2 3 4
GM-8406ZT,8406ZT-91




2
1
A-a A-b




A




B




SYSTEM POWER
C




180 6R8K




D




8 A-a
1 2 3 4
3




5
5




TAPE:-7.0dBs




270
OUTP
4R7K IND



TAPE:-2.6dBs




6
6




4




270
5
4R7K




OUTPUT OFFSET
INDICATOR




7
7




OUT
270 IN
4R7K




6




8
8




A-a B
A-a A-b




9
GM-8406ZT,8406ZT-91




A




B




D
C
B
A




D
C




10
A-a A-b




1
1




A-b
A DSP UNIT



1
GM-8406ZT,8406ZT-91




2
2




TAPE:-3.4dBs




TAPE:-15.5dBs

2 TAPE:-8.4dBs




3
3




4
4
3




5
5




OUTPUT OFFSET
INDICATOR




TAPE:+1.2dBs
CD:+8.2dBs
TUNER: -13dBs




6
6