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Diagnostic Procedure

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to SIR DIAGNOSTIC SYSTEM CHECK  .
  2. Install scan tool and check communication with each module in serial data circuit. If scan tool communicates with any module, go to next step. If scan tool does not communicate with any module, go to step  5 .
  3. Select Display DTC function for each module. If any DTCs beginning with "U" are displayed, go to step  4 . If no DTCs beginning with "U" are displayed, see DIAGNOSTIC AIDS.
  4. Diagnose and repair systems indicated.
  5. Turn ignition off. Disconnect scan tool from DLC connector. Inspect DLC terminals No. 2 and 5 for bad terminal connections. If bad terminal connectors are found, repair terminals and go to step  3 . If no connector problems are found, go to next step.
  6. Measure resistance between DLC terminal No. 5 and ground. If resistance is infinite, repair circuit and go to step  3 . If resistance is not infinite, go to next step.
  7. Disconnect bus bars from star connectors No. 1 and 2 and inspect for faulty connections. If faulty connections are found, repair connections. Go to step  3 . If connections are okay, go to next step.
  8. Test circuit S206 for an open or short condition between DLC terminal No. 2 and STAR CONNECTOR terminal "A". If short or open condition is found, repair condition. Go to step  3 . If no short or open is found, go to next step.
  9. Turn ignition off. Install scan tool. Disconnect bus bars from star connectors No. 1 and 2. Connect Serial Data Link Tester (J-42236) to star connectors. Place switch on Serial Data Link Tester to STAR CONNECTOR No. 1 position and place rotary switch to position "M". Turn ignition on. Using scan tool, attempt to communicate with Body Control Module (BCM). If scan tool communicates with BCM, go to next step. If scan tool does not communicate with BCM, go to step  12 .
  10. Place switch on Serial Data Link Tester to STAR CONNECTOR No. 1 position. Using scan tool, attempt to communicate with all control modules while rotating switch on Serial Data Link Tester. See STAR CONNECTOR NO. 1 POSITION SWITCH SETTINGS  table. If scan tool communicates with all control modules, go to next step. If scan tool does not communicate with all control modules, go to step  12 .
  11. Place switch on Serial Data Link Tester to STAR CONNECTOR No. 2 position. Using scan tool, attempt to communicate with control modules while rotating switch. See STAR CONNECTOR NO. 2 POSITION SWITCH SETTINGS  table. If scan tool communicates with all control modules, go to step  15 . If scan tool does not communicate with all control modules, go to next step.
  12. Turn ignition off. Disconnect harness connectors modules that are not communicating with scan tool. For each non communicating module, test serial data circuit for short to ground. Turn ignition on and test circuit for short to voltage. If short to either ground or voltage is found, repair circuit. Go to step  15 . If no short is found, go to step  13 .
  13. Inspect for poor connections at control module connectors. If faulty connector is found, repair connector. Go to step  15 . If no faulty connector is found, go to next step.
  14. Replace control module which is not communicating with scan tool. Go to next step.
  15. Reconnect all components. Install scan tool. Turn ignition on. Wait 10 seconds. Select Display DTCs function for each module. Record all displayed DTCs. If any current status DTCs were displayed which began with "U", go to step  17 . If no current status DTCs beginning with "U" were displayed, go to next step.
  16. If any DTCs were recorded which did not begin with "U", go to next step. If no DTCs beginning with "U" were recorded, go to step  18 .
  17. Diagnose DTCs for each module or malfunction. When diagnosis and repairs are complete, go to next step.
  18. Using scan tool, clear all DTCs. Go to SIR DIAGNOSTIC SYSTEM CHECK  .
STAR CONNECTOR NO. 1 POSITION SWITCH SETTINGS

Rotary Switch Position Control Module
"L" A-C-Heater Control (HVAC)
"J" Remove Function Actuation (RFA)
"H" Remote Time Damping (RTD)
"G" Instrument Panel Cluster (IPC)
"F" Sensing & Diagnostic Module (SDM)
"E" Traction Control System (TCS)
"D" RADIO
"B" Powertrain Control Module (PCM)
STAR CONNECTOR NO. 2 POSITION SWITCH SETTINGS

Rotary Switch Position Control Module
"C" Left Door Control Module (LDCM)
"D" Right Door Control Module (RDCM)
"K" Seat Control Module (SCM)
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