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Home >> Acura >> 2009 >> CSX Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 23 (Immobilizer System) >> Immobilizer-keyless Control Unit Input Test

Immobilizer-keyless Control Unit Input Test

WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A )
NOTE: SRS components are located in this area. Review the SRS component locations, precautions and procedures before doing repairs or servicing. See COMPONENT LOCATION INDEX , also see PRECAUTIONS AND PROCEDURES .
  1. Remove the steering column covers (see STEERING COLUMN COVER REMOVAL/INSTALLATION )
  2. Disconnect the 7P connector (A) from the immobilizer-keyless control unit (B)
    3. Fig 1: Identifying Immobilizer-Keyless Control Unit And 7P Connector Terminal
    G05989177Courtesy 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 these input tests at the following connector
    • 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
    TERMINAL CONDITION RESULT REFERENCE

    Cavity Wire Terminal name Test condition Test Desired result Possible cause if desired result is not obtained
    3 BLU B-CAN LO Disconnect the gauge control module 32P connector Check for continuity between terminal and the gauge control module 32P connector No 25 terminal
    There should be continuity    		 An open in the wire
    Disconnect driver's under-dash fuse/relay box connector P (20P) Check for continuity between the terminal and driver's under-dash fuse/relay box connector P (20P) No 5 terminal
    There should be continuity    		 An open in the wire
    4 PNK B-CAN HI Disconnect the gauge control module 32P connector Check for continuity between terminal and the gauge control module 32P connector No 26 terminal
    There should be continuity    		 An open in the wire
    Disconnect driver's under-dash fuse/relay box connector P (20P) Check for continuity between terminal and driver's under-dash fuse/relay box connector P (20P) No 6 terminal
    There should be continuity    		 An open in the wire
    6 LT GRIM IMOCD (S-NET) Disconnect PCM connector A (49P) (see ECM/PCM REPLACEMENT ) 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 terminal and body ground There should be more than 50 kΩ
    • Faulty Imoes unit (built into the MICU)
    • Faulty driver's under-dash fuse/relay box
    • An open in the wire
    Disconnect PCM connector A (49P) (see ECM/PCM REPLACEMENT ) Check for continuity between terminal and PCM connector A (49P) terminal No 46
    There should be continuity    		 An open in the wire
  5. Reconnect the connector to the immobilizer-keyless control unit, and do these input tests at the following connector
    NOTE: After replacing the immobilizer-keyless control unit, do the immobilizer registration (see IMMOBILIZER KEY REGISTRATION )
    TERMINAL CONDITION RESULT REFERENCE

    Cavity Wire Terminal name Test condition Test Desired result Possible cause if desired result is not obtained
    1 WHT VBU Under all conditions Measure the voltage to ground There should be battery voltage
    • Blown No 15 (10 A) fuse in the under-hood fuse/relay box
    • An open in the wire
    2 YEL IG1 Ignition switch ON (II) Measure the voltage to ground There should be battery voltage
    • Blown No 9 (20 A) fuse in the driver's under-dash fuse/relay box
    • An open in the wire
    7 BRN LG3 Under all conditions Measure the voltage to ground There should be less than 0 2V
    • Poor ground (G101)
    • An open in the wire
    • Faulty PCM
    5 LT BLU K-LINE Ignition switch ON (II) Measure the voltage to ground There should be 9-12 V
    • Bad control unit on the k-line
    • K-line short to ground
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