GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2002 🢒 Isuzu T-Series (Truck Line C) 🢒 Brakes 🢒 Air Brakes 🢒 Power and Grounding Component Views
Figure 1:

Fuse Blocks
Object Number: 231696 Size: LF
(1)Power Brake Booster Pump Motor Relay
(2)Fuse Block 2
(3)Front Chassis Harness
(4)Positive Battery Cable Feed
(5)Fuse Block 1
Figure 2:

Instrument Panel Harness, Lower Right Side (Relay Center 3)
Object Number: 397659 Size: LF
(1)Relay Center 3
(2)Turn/Hazard Flasher Module
(3)Blower Motor
Figure 3:

Instrument Panel, Right Side Forward View
Object Number: 228475 Size: MF
(1)Relay Center 1
(2)IP Fuse Block
Figure 4:

Instrument Panel, Center (Typical)
Object Number: 231681 Size: LF
(1)Relay Block 2
Figure 5:

Battery Cable to Engine
Object Number: 405205 Size: LF
(1)Positive Battery Cable
(2)Starter
Figure 6:

Battery Positive Cable to Side Member
Object Number: 405200 Size: LF
(1)Battery Positive Cable
Figure 7:

Engine Harness Ground to Frame
Object Number: 405208 Size: LF
(1)Engine Harness Ground Cable
(2)Left Side Frame Rail
Figure 8:

Front Chassis Harness to RH Frame, LH Forward View
Object Number: 228778 Size: MF
(1)Starter Relay
(2)Front Chassis Harness
(3)Body Builder Connector(s)
(4)Trailer Harness
(5)Rear Chassis Harness
(6)Negative Battery Cable
(7)Ground Block (Part of Negative Battery Cable, 6 cavities)
(8)Starter Relay Connector C3 (2 cavities)
(9)Starter Relay Connector C2 (1 cavity)
(10)Starter Relay Connector C1 (1 cavity)
Figure 9:

Fuse Block 1, Bottom View
Object Number: 612732 Size: MF
Figure 10:

Fuse Block 1, Top View
Object Number: 612729 Size: MF

Fuse Block 1, Top View

Fuse/Circuit Breaker

Rating

Description

BRK BOOSTMTR Fuse

60A

Power Brake Booster Pump Motor Relay, IP Fuse Block

COMPUTER/PARK BRAKE/ENG CONTROL Fuse

40A

IP Fuse Block

AUX Fuse

40A

IP Fuse Block

EXT LIGHTING Fuse

40A

IP Fuse Block

GENERATOR/CHASSIS Fuse

40A

IP Fuse Block, Ignition 1 Relay

WIPER/HVAC Fuse

40A

IP Fuse Block

Figure 11:

Fuse Block 2, Bottom View
Object Number: 612725 Size: MF
Figure 12:

Fuse Block 2, Top View
Object Number: 612727 Size: MF

Fuse Block 2, Top View

Fuse/Circuit Breaker

Rating

Description

2 SPEED AXLE Fuse

40A

Ignition 2 Relay

HVAC Fuse

40A

IP Fuse Block

TURN SIGNAL Fuse

40A

IP Fuse Block

IGNITION Fuse

40A

IP Fuse Block, Ignition 3 Relay, Accessory Relay, Trailer Stop Relay

AIR ABS RELAY Fuse/HYD ABS MODULE Fuse

30A(JE5) /60A(JE3)

Air ABS Relay, or Electronic Brake Control Module-Hydraulic

AIR ABS TRAILER RELAY Fuse

50A

Trailer Stop AIR ABS Relay

Figure 13:

IP Fuse Block, Top View
Object Number: 612720 Size: MF
Figure 14:

IP Fuse Block, Bottom View
Object Number: 612723 Size: MF

I/P Fuse Block, Bottom View

Circuit Breaker

Rating

Description

1

25A

Ignition Switch

2

15A

Radio, Cigar Lighter, Upfitter Connector

3

15A

Engine Control Module(ECM), Pressure Control Valve Relay, Hi Idle Switch, Automatic Transmission Modulator Relay

4

15A

Glow Plug Relay

5

15A

Data Link Connector (DLC)

6

15A

Daytime Running Lamps Relay, Vehicle Speed Sensor, Generator, Multifunction Alarm Module(MFAM), Speedo Adapter, Instrument Cluster(IP), Speedometer, Auxiliary Relay, Ignition 1 Relay, Ignition 2 Relay, Fuel Filter Heater Relay, Power Window Relay, Blower Motor Relay

7

20A

Horn Relay, Turn Signal Switch, Radio, Engine Shutdown Module, Dome Lamp, Dome Lamp Relay, Park Brake Control Module

8

20A

Power Window Relay

9

20A

ABS Indicator Lamp Relay, Inverting Driver Module, Backup Lamps Switch, Multifunction Alarm Module, Fuel Sender and Transfer Pump Control Module, Fuel Transfer Pump Relay, Air Brake Dryer, Moisture Ejector, Air Suspension Dump Switch, Clutch Switch, Check Connector, Exhaust Brake Switch, Exhaust Brake Relay, Air ABS Relay, Electronic Brake Control Module (JE3)

10

15A

Ignition Main Relay, Pressure Control Valve Relay

11

20A

Left Turn Trailer Relay

12

25A

Auxiliary 1 Relay

13

25A

Body Builder Connector (Battery Direct)

14

15A

LH Headlamps

15

15A

RH Headlamps

16

15A

Lighting Relays

17

--

Not Used

18

15A

Multifunction Alarm Module (MFAM)

19

15A

Taillamp Relay

20

20A

A/C Compressor, A/C Condensor Fan

21

20A

Windshield Wiper Motor, Windshield Washer Pump

22

20A

Heated Mirror Switch, Two-Speed Axle Motor Relay

23

20A

Stop Lamp Relay, Stop Lamp Switch

24

20A

Blower Motor Relay

25

15A

Trailer Stop Lamp Switch (JE5), RH Turn Trailer Relay

26

20A

Auxiliary Power Post

Figure 15:

Relay Center 1
Object Number: 621153 Size: MF
(1)Power Window Relay
(2)Fuel Heater Relay
(3)ABS Indicator Lamp Relay
(4)Lighting Relay
(5)Lighting (Low, Hi) Relay
(6)Left Turn/Trailer Relay
(7)Tail Lamp Relay
(8)Park Brake Relay (w/J71 Park Brake)
(9)Right Turn/Trailer Relay
Figure 16:

Relay Center 2
Object Number: 621154 Size: MF
(1)A/C Condensor Fan Relay
(2)A/C Compressor Relay
(3)Blower Relay
(4)Accessory Relay
(5)Ignition 1 Relay
(6)Ignition 2 Relay
(7)Auxiliary Relay
(8)Horn Relay
(9)Ignition 3 Relay
(11)Stop Lamp Relay
(12)Automatic Transmission Modulator Relay
Figure 17:

Relay Center 3
Object Number: 621151 Size: MF
(1)Exhaust Brake Relay
(2)DRL ON Relay
(3)DRL OFF 2 Relay
(4)DRL OFF Relay
(5)DRL Indicator Lamp Relay