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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 743 (IMMOBILIZER SYSTEM)IMMOBILIZER-KEYLESS CONTROL UNIT INPUT TEST
2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Immobilizer-Keyless Control Unit Input Test

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Immobilizer-Keyless Control Unit Input Test
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the steering column covers (see GLOVE BOX STRIKER REPLACEMENT ).
  2. Disconnect the 7P connector (A) from the immobilizer-keyless control unit (B).
    Fig 1: Identifying 7P Connector And Immobilizer-Keyless Control Unit
    G06431771Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Inspect the connector and socket terminals to be sure they are all making good contact.
    • If the terminals are bent, loose, or corroded, repair them as necessary, and recheck the system.
    • If the terminals look OK, go to step 4.
  4. With the connector still disconnected, do the following input tests:
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, go to step 5.
    WIRE SPECIFICATIONS

    Cavity Wire Terminal name Test condition Test: Desired result Possible cause if desired result is not obtained
    4 GRN B-CAN Disconnect the gauge control module 32P connector Check for continuity between the terminal No. 4 and the gauge control module 32P connector terminal No. 17: There should be continuity. An open in the wire
    Disconnect driver's under-dash fuse/relay box connector Q(16P) Check for continuity between the terminal No. 4 and driver's under-dash fuse/relay box connector Q(16P) terminal No. 3: There should be continuity. An open in the wire
    3 GRN IMOCD (S-NET) Disconnect PCM connector A (44P) (see HOW TO TROUBLESHOOT CIRCUITS AT THE PCM CONNECTORS ) Measure the voltage to ground: There should be about 5 V.
    • A short to ground in the wire
    • An open in the wire
    Disconnect the battery negative terminal Measure the resistance between the terminal No. 3 and body ground: There should be more than 50 kΞ©
    • Faulty imoes unit
    • Faulty under-dash fuse/relay box
    • An open in the wire
    Disconnect PCM connector A (44P) (see HOW TO TROUBLESHOOT CIRCUITS AT THE PCM CONNECTORS ) Check for continuity between the terminal No. 3 and PCM connector A (44P) terminal No. 44: There should be continuity. An open in the wire
  5. Reconnect the connector to the immobilizer-keyless control unit, and do the following input tests:
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, replace the immobilizer-keyless control unit (see IMMOBILIZER-KEYLESS CONTROL UNIT REPLACEMENTΒ  ).
    NOTE: After replacing the immobilizer-keyless control unit, do the immobilizer registration (see IMMOBILIZER KEY REGISTRATIONΒ  ).
    WIRE SPECIFICATIONS

    Cavity Wire Terminal name Test condition Test: Desired result Possible cause if desired result is not obtained
    1 PNK +B BACK UP Under all conditions Measure the voltage to ground: There should be battery voltage.
    • Blown No. 1 (15 A) fuse in the under-dash fuse/relay box
    • An open in the wire
    2 RED IG1 Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage.
    • Blown No. 20 (15 A) fuse in the under-dash fuse/relay box
    • An open in the wire
    6 GRY KEY SW Ignition key inserted into the ignition switch Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G502)
    • Faulty ignition key switch
    • An open in the wire
    7 BRN LG Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground(G101)
    • An open in the wire
    5 BLU K-LINE Under all conditions Measure the voltage to ground: There should be 9-12V.
    • Bad control unit on the K-line
    • K-line short to ground
RENDER: 1.0x

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