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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN C1500, 5.3 ZREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1942 (HYBRID/EV CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P1A89CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban C1500, 5.3 Z

Circuit/System Testing

2006 Chevrolet Suburban C1500, 5.3 ZSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X2 harness connector at the K1 accessory DC power control module.
  2. Ignition ON, command the accessory DC power control module Intermediate Voltage Control on the scan tool to turn On the 42 volt circuit.
  3. Test for 40-44 V between the 42 V reference output terminals 1 and 2 at the K1 accessory DC power control module.
    • If less than the specified range, replace the K1 accessory DC power control module.
  4. If the accessory DC power control module 42 V output tests normal, replace the K43 power steering control module.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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