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Home >> Buick >> 2000 >> LeSabre Custom, 4T65E/MN3 >> Repair and Diagnosis >> Electrical >> Charging Systems >> Self-Diagnostic System >> Diagnostic System Check

Diagnostic System Check

  1. Ensure battery condition, cold cranking amperage and reserve capacity meet specifications. Replace as necessary. Install scan tool. If scan tool powers up, go to next step. If scan tool does not power up, see SCAN TOOL DOES NOT POWER UP in BODY CONTROL MODULES - BONNEVILLE & LESABRE article in ACCESSORIES & EQUIPMENT.
  2. Turn ignition on, engine off. Try to establish scan tool communication with each module on Class 2 serial data circuit. If communication with each module is established, go to next step. If communication with each module is not established, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in BODY CONTROL MODULES - BONNEVILLE & LESABRE article in ACCESSORIES & EQUIPMENT.
  3. Select display DTC function for each module. Record all displayed DTCs, status of displayed DTCs and module that set the DTC. If DTCs are displayed, go to next step. If no DTCs are displayed, see ON-VEHICLE TESTING  .
  4. Retrieve codes and perform appropriate test. See DIAGNOSTIC TROUBLE CODE INDEX  table.
    DIAGNOSTIC TROUBLE CODE INDEX

    DTC (1)(2) Description
    B1000, B1004, B1007 or B1009 (3)
    B1327 (3)
    B1513  Charging System Volts Low
    B1514  Charging System Volts High
    (1) For any DTC beginning with the letter "U", see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in BODY CONTROL MODULES - BONNEVILLE & LESABRE article in ACCESSORIES & EQUIPMENT.
    (2) For any DTC beginning with the letter "P", see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
    (3) See DIAGNOSTIC TESTS in BODY CONTROL MODULES - BONNEVILLE & LESABRE article in ACCESSORIES & EQUIPMENT.
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