GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Chevy P12 Chassis 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Harness Routing Views

Whenever moving any of the wiring, replace the wiring in the original position. Whenever moving the harnesses in order to reach a component, ensure that all the harnesses are routed correctly. Replace broken clips or retainers. Electrical problems can result from loose wiring or harnesses which shift from the original positions, or which are routed incorrectly.

Figure 1:

Dash Wiring-Right Side
Object Number: 290833 Size: LF
(1)Park Brake Pull Button Switch Connector
(2)Windshield Wiper Pulse Control Module Connector
(3)Accelerator Pedal Position (APP) Sensor Connector
(4)Stoplamp Switch Connector
(5)S223
(6)S224
Figure 2:

Dash Wiring-Top Left
Object Number: 290830 Size: LF
(1)S222, S225, S226
(2)G200
(3)Park Brake Pull Button Switch Connector
(4)C203
(5)C202
(6)S227, S228, S229, S230, S231, S232
(7)Steering Column
(8)Fuse Block (located by body builder)
(9)Transmission Range (TR) Shift Control Connector
(10)S211, S212, S213
(11)Daytime Running Lamps (DRL) Diode Module Connector
(12)Steering Column Connector
(13)Diode Network
(14)Speedometer Adapter Module Connector
(15)S215, S216, S217, S219, S220, S236
(16)S200
(17)DRL Control Module
(18)S201, S202, S203, S204, S205, S206
(19)S221
(20)S207, S208, S209, S210
(21)Park Brake Alarm (located by body builder)
Figure 3:

Dash Wiring-Lower Left
Object Number: 290827 Size: LF
(1)Steering Column Support
(2)Throttle Actuator Control (TAC) Module Connector C2
(3)Throttle Actuator Control (TAC) Module Connector C1
(4)Data Link Connector (DLC)
(5)IP Wiring Harness Junction Block
(6)C101
(7)C113
(8)C104
Figure 4:

Engine Harness to IP Harness
Object Number: 240960 Size: LF
(1)Park Brake Pull Button Switch
(2)Powertrain Control Module (PCM)
(3)PCM Connector C1
(4)PCM Connector C2
(5)S110
(6)S113
(7)S114
(8)S115
(9)IP Wiring Harness Junction Block
(10)S116
(11)C100
(12)C104
(13)C101
(14)C113
(15)Engine Wiring Harness Junction Block (Underhood Fuse Relay Center)
(16)P100
(17)Speedometer Adapter Module
(18)Daytime Running Lamps (DRL) Diode Module
Figure 5:

Engine Harness-Left Side
Object Number: 293314 Size: MF
(1)S108, S109
(2)Engine Harness
(3)EVAP Connector
(4)EGR Connector
(5)C102
(6)Knock Sensor Connector
(7)A/C Compressor Cutoff Switch Connector
(8)Wheel Speed Sensor Connector
(9)S113
(10)S110
(11)A/C Compressor Clutch Connector
(12)A/C Compressor
(13)S106, S107, S111, S112
Figure 6:

Radiator Support Wiring
Object Number: 240952 Size: MF
(1)Power Brake Booster Pump
(2)S122
(3)S123
(4)Power Brake Booster Pump Relay
(5)S120
(6)Power Brake Booster Pump Motor
(7)S121
(8)S117, S118
(9)ABS Module
(10)S119
(11)G101
(12)RH Wheel Speed Sensor
(13)Intake Air Temperature (IAT) Sensor
(14)Engine Coolant Level Switch
(15)Engine Coolant Surge Tank
(16)Powertrain Control Module (PCM)
(17)Power Brake Booster Fluid Flow Indicator Switch
Figure 7:

Engine Harness Right Front
Object Number: 240962 Size: LF
(1)S101
(2)S105
(3)G102
(4)Manifold Absolute Pressure (MAP) Sensor
(5)Crankshaft Position (CKP) Sensor
(6)Generator
(7)Throttle Position (TP) Sensor
(8)G103, G104, G109
(9)Engine Coolant Temperature (ECT) Sensor
(10)C103
(11)Throttle Actuator Motor
(12)S100
(13)S103
(14)S102
(15)Engine Harness
Figure 8:

Engine Harness-Right Rear
Object Number: 293315 Size: MF
(1)Engine Harness
(2)C103
(3)Engine Coolant Temperature (ECT) Sensor Connector
(4)HO2S Bank 2 Sensor 1 Connector
(5)Engine Oil Pressure Sensor Connector
(6)Camshaft Position (CMP) Sensor Connector
(7)C105
Figure 9:

Inline Connectors on Top of the Transmission
Object Number: 261911 Size: LF
(1)C112
(2)Battery Cable
(3)C111
(4)S300
(5)Transmission
(6)C110
Figure 10:

Park Brake Harness Connections and Grounds
Object Number: 317451 Size: SF
(1)S302
(2)Rear Chassis Harness
(3)C300
(4)G300, G400
(5)C301
(6)S306, S307, S308, S309
(7)S303, S304, S305
(8)S407
(9)Auto Apply Park Brake Harness