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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1042 (ENGINE CONTROLS AND FUEL - 6.6L (LMM) - INTRODUCTION (2 OF 2))COMPONENT LOCATORENGINE CONTROLS CONNECTORSINTAKE AIR HEATER (IAH) MODULE X1
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Intake Air Heater (IAH) Module X1

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Intake Air Heater (IAH) Module X1
WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Intake Air Heater (IAH) Module X1 Connector End View
GM1583743Courtesy of GENERAL MOTORS CORP.
Intake Air Heater (IAH) Module X1 Connector Parts Information

Connector Part Information 
  • OEM: DT16-6S-KP01
  • Service: See Catalog
  • Description: 6-Way F Sealed (GN)
Terminal Part Information 
  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit
Intake Air Heater (IAH) Module X1 Connector Terminal Identification

Pin Wire Color Circuit No. Function
1 0.75 BK IC180 IAH Temperature Signal
2 1 OG IC181 IAH Command 1
3 0.75 YE IC182 IAH Command 2
4 0.75 PK IC183 IAH Current Signal
5 0.75 TN IC184 IAH Voltage Signal
6 0.75 RD IC185 IAH Feedback Signal
RENDER: 1.0x

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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.