Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 764 (COMPONENT LOCATIONS - ELECTRICAL CENTER IDENTIFICATION VIEWS)ELECTRICAL CENTER IDENTIFICATION VIEWSJUNCTION BLOCK - RIGHT I/P X1 (WIRE ENTRY)
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Junction Block - Right I/P X1 (Wire Entry)
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Junction Block - Right I/P X1 (Wire Entry)
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Junction Block - Right I/P X1 (Wire Entry)
| Pin | Wire | Circuit | Function |
|---|---|---|---|
| 2A1 | 0.5 RD/WH | 1540 | Battery Positive Voltage (U42 or DNU) |
| 2A2-2A6 | - | - | Not Used |
| 2A7 | 3 BK | 1050 | Ground Bus |
| 2B1 | 3 RD/WH | 3140 | Battery Positive Voltage (CF5 or TRW) |
| 2B2 | - | - | Not Used |
| 2B3 | 0.35 YE | 43 | Accessory Voltage (CF5) |
| 2B4 | 0.5 BN/WH | 230 | Instrument Panel Lamp Dimming Control (CF5) |
| 2B5-2B6 | - | - | Not Used |
| 2B7 | 0.35 OG | 300 | Ignition 3 Voltage (EXP with CF5) |
| 3A1 | 0.8 D-GN | 117 | Right Front Speaker Output (-) |
| 3A2 | 0.8 L-GN | 200 | Right Front Speaker Output (+) |
| 3A3 | - | - | Not Used |
| 3A4 | 0.8 D-BU/WH | 1315 | Right Front Turn Signal Lamp Control (with DL3 or with DPN) |
| 0.8 D-BU/WH | 1315 | Right Front Turn Signal Lamp Control (with DL3 or with DPN) | |
| 3A5-3A6 | - | - | Not Used |
| 3A7 | 3 BK | 1050 | Ground |
| 3B1 | 0.35 D-GN | 5060 | Low Speed GMLAN Serial Data |
| 3B2 | 0.8 RD/WH | 240 | Battery Positive Voltage |
| 3B3 | - | - | Not Used |
| 3B4 | 2 RD/WH | 1340 | Battery Positive Voltage |
| 3B5-3B7 | - | - | Not Used |
| 4A1 | 0.35 GY | 598 | 5-Volt Reference |
| 4A2 | 0.35 TN | 520 | Lower Right Air Temperature Sensor Signal (CJ2) |
| 4A3 | 0.35 TN | 518 | Lower Left Air Temperature Sensor Signal (CJ2) |
| 4A4 | 0.35 YE | 1791 | Low Reference |
| 4A5 | 0.35 PU | 1838 | Recirculation Door Position Signal (CJ2) |
| 4A6 | 0.35 GY/BK | 754 | Blower Motor Speed Control |
| 4A7 | - | - | Ground Bus |
| 4B1 | - | - | 5-Volt Reference Bus |
| 4B2 | 0.35 D-BU | 1199 | Air Temperature Door Control |
| 4B3 | 0.35 TN | 2273 | Mode Door Control |
| 4B4 | - | - | Not Used |
| 4B5 | 0.35 YE/BK | 713 | Defrost/Heater Mode Valve Position Sensor Signal |
| 4B6 | 0.35 L-BU | 733 | Air Temperature Door Position Signal |
| 4B7 | 0.35 WH | 2622 | (except HP2) |
| 5A | 0.5 D-GN | 6101 | Low Reference |
| 5B | 0.35 PK | 839 | Ignition Voltage |
| 0.35 PK | 839 | Ignition Voltage | |
| 5C | 0.35 PK | 839 | Ignition Voltage |
| 5D | 0.35 D-BU | 1646 | Auxiliary Air Temperature Door Position Signal |
| 5E | 0.35 WH/BK | 1236 | Auxiliary Air Temperature Door Control |
| 5F | 0.35 D-GN | 1614 | Recirculation Door Control |
| 6A | 0.5 RD/BK | 542 | Battery Positive Voltage |
| 6B | 3 BK | 1050 | Ground |
| 3 BK | 1050 | Ground |
Connector Part Information
Terminal Part Information
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RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.