Transfer Case Control Components. Isuzu S/T Isuzu

GM Service Manual Online

For 1990-2009 cars only

Makes 🢒 Isuzu 🢒 1998 🢒 S/T Isuzu - 2WD 🢒 Driveline/Axle 🢒 Transfer Case 🢒 Transfer Case Control Components

Name

Location

Locator View

Connector End View

4WD Fuse 15 (IP Fuse Block) (4.3L Engine)

In the IP Fuse Block

IP Fuse Block Details in Power Distribution in Engine Electrical

ATC Fuse (UBEC) (W/ Electric Shift 4WD or Active Transfer Case)

In the Underhood Bussed Electrical Center

Figure 6: UBEC Internal Location View


(1)	BTSI Fuse (10 A) (W/ A/T)
(2)	B/U LP Fuse (UBEC) (25 A)
(3)	Starter Relay (Mini Relay)
(4)	IGN B MaxiFuse (50 A)
(5)	IGN E Fuse (UBEC) (10 A)
(6)	RAP MaxiFuse (40 A)
(7)	OXYSEN Fuse (UBEC) (20 A)
(8)	IGN A MaxiFuse (UBEC) (40 A)
(9)	LR PRK (10 A)
(10)	PARKLP Fuse (20 A)
(11)	ATC Fuse (20 A)
(12)	HVAC Fuse (30 A)
(13)	TRCHMSL Fuse (10 A)
(14)	HAZLP Fuse (20 A)
(15)	VECHMSL Fuse (10 A)
(16)	Headlamp Grounding Relay (Micro Relay)
(17)	CRANK Fuse (10 A)
(18)	STOPLP Fuse (20 A)
(19)	TBC Fuse (10 A)
(20)	High Mounted Stop Lamp Relay (Micro Relay) (Pickup)
(21)	IGN C Fuse (15 A)
(22)	FOG LP Fuse (15 A)
(23)	Daytime Running Lights Relay Diode
(24)	A/C Fuse (10 A)
(25)	A/C Compressor Clutch Relay (Micro Relay)
(26)	Horn Relay (Micro Relay)
(27)	HORN Fuse (15 A)
(28)	Daytime Running Lights Relay (Micro Relay)
(29)	Fuel Pump Prime Connector
(30)	RT HDLP Fuse (10 A)
(31)	FR PRK Fuse (10 A)
(32)	LT TURN Fuse (Front) (10 A)
(33)	RT TURN Fuse (Front) (10 A)
(34)	Headlamp Power Relay (Micro Relay)
(35)	LT HDLP Fuse (10 A)
(36)	RR PRK Fuse (10 A)
(37)	VEH B/U Fuse (15 A)
(38)	ECM B Fuse (20 A)
(39)	RT TRN Fuse (Rear) (10 A)
(40)	LT TRN Fuse (Rear) (10 A)
(41)	ENG I Fuse (UBEC) (10 A)
(42)	ECM I Fuse (UBEC) (15 A)
(43)	INT BAT MaxiFuse (50 A)
(44)	ABS MaxiFuse (60 A)
(45)	Fuel Pump Relay (Micro Relay)

in Starter And Charging Component Views in Engine Electrical in Engine

Body Bussed Electrical Center (BBEC)

LH side of dash, near IP fuse Block

BTSI Fuse (UBEC)

In the Underhood Bussed Electrical Center

Figure 6: UBEC Internal Location View


(1)	BTSI Fuse (10 A) (W/ A/T)
(2)	B/U LP Fuse (UBEC) (25 A)
(3)	Starter Relay (Mini Relay)
(4)	IGN B MaxiFuse (50 A)
(5)	IGN E Fuse (UBEC) (10 A)
(6)	RAP MaxiFuse (40 A)
(7)	OXYSEN Fuse (UBEC) (20 A)
(8)	IGN A MaxiFuse (UBEC) (40 A)
(9)	LR PRK (10 A)
(10)	PARKLP Fuse (20 A)
(11)	ATC Fuse (20 A)
(12)	HVAC Fuse (30 A)
(13)	TRCHMSL Fuse (10 A)
(14)	HAZLP Fuse (20 A)
(15)	VECHMSL Fuse (10 A)
(16)	Headlamp Grounding Relay (Micro Relay)
(17)	CRANK Fuse (10 A)
(18)	STOPLP Fuse (20 A)
(19)	TBC Fuse (10 A)
(20)	High Mounted Stop Lamp Relay (Micro Relay) (Pickup)
(21)	IGN C Fuse (15 A)
(22)	FOG LP Fuse (15 A)
(23)	Daytime Running Lights Relay Diode
(24)	A/C Fuse (10 A)
(25)	A/C Compressor Clutch Relay (Micro Relay)
(26)	Horn Relay (Micro Relay)
(27)	HORN Fuse (15 A)
(28)	Daytime Running Lights Relay (Micro Relay)
(29)	Fuel Pump Prime Connector
(30)	RT HDLP Fuse (10 A)
(31)	FR PRK Fuse (10 A)
(32)	LT TURN Fuse (Front) (10 A)
(33)	RT TURN Fuse (Front) (10 A)
(34)	Headlamp Power Relay (Micro Relay)
(35)	LT HDLP Fuse (10 A)
(36)	RR PRK Fuse (10 A)
(37)	VEH B/U Fuse (15 A)
(38)	ECM B Fuse (20 A)
(39)	RT TRN Fuse (Rear) (10 A)
(40)	LT TRN Fuse (Rear) (10 A)
(41)	ENG I Fuse (UBEC) (10 A)
(42)	ECM I Fuse (UBEC) (15 A)
(43)	INT BAT MaxiFuse (50 A)
(44)	ABS MaxiFuse (60 A)
(45)	Fuel Pump Relay (Micro Relay)

in Starter And Charging Component Viiews in Engine Electrical in Engine

CRANK Fuse (UBEC)

In the Underhood Bussed Electrical Center

Figure 6: UBEC Internal Location View


(1)	BTSI Fuse (10 A) (W/ A/T)
(2)	B/U LP Fuse (UBEC) (25 A)
(3)	Starter Relay (Mini Relay)
(4)	IGN B MaxiFuse (50 A)
(5)	IGN E Fuse (UBEC) (10 A)
(6)	RAP MaxiFuse (40 A)
(7)	OXYSEN Fuse (UBEC) (20 A)
(8)	IGN A MaxiFuse (UBEC) (40 A)
(9)	LR PRK (10 A)
(10)	PARKLP Fuse (20 A)
(11)	ATC Fuse (20 A)
(12)	HVAC Fuse (30 A)
(13)	TRCHMSL Fuse (10 A)
(14)	HAZLP Fuse (20 A)
(15)	VECHMSL Fuse (10 A)
(16)	Headlamp Grounding Relay (Micro Relay)
(17)	CRANK Fuse (10 A)
(18)	STOPLP Fuse (20 A)
(19)	TBC Fuse (10 A)
(20)	High Mounted Stop Lamp Relay (Micro Relay) (Pickup)
(21)	IGN C Fuse (15 A)
(22)	FOG LP Fuse (15 A)
(23)	Daytime Running Lights Relay Diode
(24)	A/C Fuse (10 A)
(25)	A/C Compressor Clutch Relay (Micro Relay)
(26)	Horn Relay (Micro Relay)
(27)	HORN Fuse (15 A)
(28)	Daytime Running Lights Relay (Micro Relay)
(29)	Fuel Pump Prime Connector
(30)	RT HDLP Fuse (10 A)
(31)	FR PRK Fuse (10 A)
(32)	LT TURN Fuse (Front) (10 A)
(33)	RT TURN Fuse (Front) (10 A)
(34)	Headlamp Power Relay (Micro Relay)
(35)	LT HDLP Fuse (10 A)
(36)	RR PRK Fuse (10 A)
(37)	VEH B/U Fuse (15 A)
(38)	ECM B Fuse (20 A)
(39)	RT TRN Fuse (Rear) (10 A)
(40)	LT TRN Fuse (Rear) (10 A)
(41)	ENG I Fuse (UBEC) (10 A)
(42)	ECM I Fuse (UBEC) (15 A)
(43)	INT BAT MaxiFuse (50 A)
(44)	ABS MaxiFuse (60 A)
(45)	Fuel Pump Relay (Micro Relay)

in Starter And Charging Component Viiews in Engine Electrical in Engine

CTSY LP Fuse 8 (IP Fuse Block)

In the IP Fuse Block

IP Fuse Block Details in Power Distribution in Engine Electrical

Data Link Connector

Lower LH side of instrument panel

Page 202-3 in Connector End Views in Electrical Diagnosis

Electric Shift Transfer Case (W/ S4WD)

To the rear of the transmission

Figure 1: Electric Shift Transfer Case Locator View


(1)	Connector C116 (Engine Harness to VSS Extension Harness)
(2)	Electric Shift Transfer Case
(3)	Vehicle Speed Sensor (W/ Electric Shift 4WD)
(4)	Electric Shift Transfer Case extension harness connector

in Transfer Case Component Views in Transfer Case in Driveline/ Axle

Electronic Brake Control Module (Part of Brake Pressure Modulator Valve)

LH front fenderwell between the Underhood Bussed Electrical Center and Grommet P100

Figure 3: Brake Control Module Locator View


(1)	Electronic Brake Control Module
(2)	Electronic Brake Control Module Connector C1
(3)	Electronic Brake Control Module Connector C3
(4)	Brake Pressure Modulating Valve
(5)	Brake Pressure Warning Switch
(6)	Combination Valve

in Antilock Brakes System Component Views in Antilock Brakes System in Brakes

Electronic Brake Control Module (Part of Brake Pressure Modulator Valve) Connector C2 (2 Cavities)

Body harness connector on LH of Electronic Brake Control Module/Brake Pressure Modulator Valve

Figure 1: Brake Control Module Connector C2 Locator View


(1)	Electronic Brake Control Module
(2)	Connector C2

in Antilock Brakes System Component Views in Antilock Brakes System in Brakes

Page 202-4 in Connector End Views in Electrical Diagnosis

Front Axle Switch

Front axle, right of differential

Figure 3: Front Axle Switch Locator View


(1)	Front Axle Switch (W/ Electric Shift 4WD)
(2)	Front axle

in Transfer Case Component Views in Transfer Case in Driveline/ Axle

ILLUM Fuse 5 (IP Fuse Block)

In the IP Fuse Block

IP Fuse Block Details in Power Distribution in Engine Electrical

IP Fuse Block

LH side of the IP near the left front side door jamb switch

Figure 8 in Electrical Component Location Views in Electrical Diagnosis

Stop Lamp Switch

Mounted on brake pedal

Figure1: Floor Pedals Locator View


(1)	Dash panel
(2)	Stop Lamp Switch
(3)	Brake pedal
(4)	Manual Transmission Clutch Start Switch
(5)	Clutch Pedal

in Starter And Charging Component Views in Engine Electrical in Engine

Page 202-11 in Connector End Views in Electrical Diagnosis

Transfer Case Control Module (TCCM) (NP1)

Behind Center of Instrument Panel

Figure 5: Shift Control Module Locator View


(1)	Side cowl panel
(2)	Body harness to Connector C203
(3)	Grounds G203, G204, and G205
(4)	Transfer Case Control Module (S4WD)

in Transfer Case Component Views in Transfer Case in Driveline/ Axle

Page 202-12 in Connector End Views in Electrical Diagnosis

Transfer Case Select Switch

Front center of instrument panel above and to the left of the radio

Figure 4: Instrument Panel Center Switch Locator View


(1)	Instrument Panel (IP)
(2)	Transfer Case Select Switch (W/ Electric Shift 4WD)
(3)	Supplemental Restraint IP Module Switch
(4)	Transfer Case Select Switch Connector C2
(5)	Transfer Case Select Switch Connector C1

in Transfer Case Component Views in Transfer Case in Driveline/ Axle

Transfer Case Select Switch (W/ Electric Shift 4WD) Connector C1 (8 Cavities)

Front center of instrument panel above and to the left of the radio

Figure 4: Instrument Panel Center Switch Locator View


(1)	Instrument Panel (IP)
(2)	Transfer Case Select Switch (W/ Electric Shift 4WD)
(3)	Supplemental Restraint IP Module Switch
(4)	Transfer Case Select Switch Connector C2
(5)	Transfer Case Select Switch Connector C1

in Transfer Case Component Views in Transfer Case in Driveline/ Axle

Page 202-12 in Connector End Views in Electrical Diagnosis

Transfer Case Select Switch (W/ Electric Shift 4WD) Connector C2 (4 Cavities)

Front center of instrument panel above and to the left of the radio

Figure 4: Instrument Panel Center Switch Locator View


(1)	Instrument Panel (IP)
(2)	Transfer Case Select Switch (W/ Electric Shift 4WD)
(3)	Supplemental Restraint IP Module Switch
(4)	Transfer Case Select Switch Connector C2
(5)	Transfer Case Select Switch Connector C1

in Transfer Case Component Views in Transfer Case in Driveline/ Axle

Page 202-12 in Connector End Views in Electrical Diagnosis

Truck Body Control Module

Lower rear of IP on the heater assembly

Figure 8 in Electrical Component Location Views in Electrical Diagnosis

Truck Body Control Module Connector C2 (24 Cavities)

Lower rear of IP on the heater assembly

Page 202-15 in Connector End Views in Electrical Diagnosis

Underhood Bussed Electrical Center (UBEC)

Over left front fender well

Underhood Bussed Electrical Center (UBEC) Connector C1 (Body, 68 Cavities)

Below the Underhood Bussed Electrical Center

Vehicle Control Module (VCM) (4.3L Engine)

RH side of engine compartment

VCM


(1)	Vehicle Control Module (VCM)
(2)	Right Front Fender
(3)	VCM Connector (Blue)
(4)	VCM Connector (Clear)
(5)	VCM Connector Retainer
(6)	VCM Connector (Black)
(7)	VCM Connector (Red)
(8)	VCM Retainer

in Engine Controls Component Views in Engine Controls - 4.3L in Engine

Vehicle Control Module (VCM) (4.3L Engine) Connector C4 (24 Cavities)

RH side of engine compartment

VCM


(1)	Vehicle Control Module (VCM)
(2)	Right Front Fender
(3)	VCM Connector (Blue)
(4)	VCM Connector (Clear)
(5)	VCM Connector Retainer
(6)	VCM Connector (Black)
(7)	VCM Connector (Red)
(8)	VCM Retainer

in Engine Controls Component Views in Engine Controls - 4.3L in Engine

VCM Connector End Views in Engine Controls - 4.3L in Engine

C101 (Engine Harness to Body Harness) (4.3L Engine, 10 Cavities)

RH engine compartment, near VCM

Page 202-18 in Connector End Views in Electrical Diagnosis

C108 (Electric Shift Transfer Case extension harness to Body Harness) (7 Cavities)

LH rear engine compartment near cowl penetration P100

Figure 2: Transfer Case In-Line Connector Locator View


(1)	Brake Booster
(2)	Connector C108 (Body Harness to Transfer Case Extension Harness)

in Transfer Case Component Views in Transfer Case in Driveline/ Axle

Page 202-22 in Connector End Views in Electrical Diagnosis

C114 (Body harness to front axle switch extension harness) (2 Cavities)

LH center of engine compartment, near the electronic brake control module)

Figure 6: LH Front Fender Area Locator View


(1)	Electronic Brake Control Module Connector C1
(2)	Electronic Brake Control Module Connector C2
(3)	Connector C109 (Body Harness to 4WAL Harness)
(4)	Ground G110
(5)	Windshield Washer Pump
(6)	Underhood Bussed Electrical Center (UBEC)
(7)	Connector C114 (Body Harness to Front Axle Switch, W/ Electric Shift 4WD)
(8)	Brake Pressure Warning Switch
(9)	Connector C108 (Body Harness to S4WD Extension Harness)

in Transfer Case Component Views in Transfer Case in Driveline/ Axle

Page 202-24 in Connector End Views in Electrical Diagnosis

C203 (Body Harness to IP Harness) (116 Cavities)

RH side of dash

Figure 5: Shift Control Module Locator View


(1)	Side cowl panel
(2)	Body harness to Connector C203
(3)	Grounds G203, G204, and G205
(4)	Transfer Case Control Module (S4WD)

in Transfer Case Component Views in Transfer Case in Driveline/ Axle

Page 202-26 in Connector End Views in Electrical Diagnosis

G203 Circuit 1050, Body Harness)

RH Dash panel, between IP Body Connector C203 and Splice Packs

Figure 5: Shift Control Module Locator View


(1)	Side cowl panel
(2)	Body harness to Connector C203
(3)	Grounds G203, G204, and G205
(4)	Transfer Case Control Module (S4WD)

in Transfer Case Component Views in Transfer Case in Driveline/ Axle

G204 Circuit 1050, Body Harness)

RH Dash panel, between IP Body Connector C203 and Splice Packs

Figure 5: Shift Control Module Locator View


(1)	Side cowl panel
(2)	Body harness to Connector C203
(3)	Grounds G203, G204, and G205
(4)	Transfer Case Control Module (S4WD)

in Transfer Case Component Views in Transfer Case in Driveline/ Axle

G205 Circuit 1050, Body Harness)

RH Dash panel, between IP Body Connector C203 and Splice Packs

Figure 5: Shift Control Module Locator View


(1)	Side cowl panel
(2)	Body harness to Connector C203
(3)	Grounds G203, G204, and G205
(4)	Transfer Case Control Module (S4WD)

in Transfer Case Component Views in Transfer Case in Driveline/ Axle

P100 (IP Bulkhead Pass-Through)

LH rear of engine compartment, on cowl

S121 (Circuit 1695, Body Harness W/ 4WD)

Between the breakouts to the VCM and the blower motor relay, 13 cm from the breakout to the VCM

S205 (Circuit 1220, IP Harness)

Between the breakouts for the radio and Truck Body Control Module Connector C3, 8 cm from the breakout to the radio

S208 (Circuit 40, IP Harness)

IP Harness lower center, between the breakouts for the radio and RH courtesy lamps, 4 cm from the breakout to the courtesy lamp

SP200 (Circuits 41, 241, 341, 817 Splice Pack, Body Harness)

Strapped to the body harness in the center front of dash area, to the right of SP204

SP203 (Circuit 1050 Splice Pack, IP Harness)

On the IP Assembly, in front of the IP ashtray assembly

SP204 (Circuits 584, 1414, 1415 Splice Pack, Body Harness)

Strapped to the body harness in the center front of dash area, to the left of SP200