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Home >> Oldsmobile >> 2000 >> Intrigue GL >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Data Link Communications System >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Class 2 Device >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 2. A partial malfunction in the class 2 serial data circuit uses a different procedure from a total malfunction of the class 2 serial data circuit. The following modules communicate on the class 2 serial data circuit:
    • PCM
    • EBCM
    • SDM
    • IPC
    • BCM
    • HVAC
  2. 3. The following DTC's may be retrieved with a history status, but are not the cause of the present condition:
    • U1300
    • U1301
  3. 6. A State of Health DTC for a specific module with a history status may be present along with a U1000 or U1255 with a current status. This indicates that the malfunction occurred when the ignition was ON.
  4. 7. Data link connector terminals 2 and 5 provide the connection to the class 2 serial data circuit and the signal ground circuit respectively.
  5. 9. A poor connection at the star connector terminal for the DLC would cause this condition but will not set a DTC.
  6. 10. An open in the class 2 serial data circuit between the DLC and star connector will prevent the scan tool from communicating with any module. This condition will not set a DTC.
  7. 11. The BCM detects the ignition switch position and sends the appropriate power mode message to the other modules. The BCM must remain connected to the DLC for any other module to communicate with the scan tool. This test isolates the BCM class 2 serial data circuit.
  8. 13. This test isolates the PCM class 2 serial data circuit.
  9. 15. This test isolates the EBCM class 2 serial data circuit.
  10. 17. This test isolates the SDM class 2 serial data circuit.
  11. 19. This test isolates the instrument cluster class 2 serial data circuit.
  12. 21. This test isolates the HVAC class 2 serial data circuit.
  13. 24. The communication malfunction may have prevented diagnosis of the customer complaint.
  14. 25. If there are no current DTC's that begin with a U, the communication malfunction has been repaired.
    SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE

    Step Action Value(s) Yes No
    1 Does the scan tool power up? -- Go to Step 2 Go to Scan Tool Does Not Power Up
    2 1. Turn ON the ignition, leaving the engine OFF.
    2. Attempt to communicate with each module on the class 2 serial data circuit. (If using a Tech 2, obtain this information using the Class 2 Message Monitor feature.)
    Does the scan tool communicate with any module on the Class 2 serial data circuit?    		 -- Go to Step 3 Go to Step 7
    3 1. Select the Display DTCs function for each module. (If using a Tech 2, use the Class 2 DTC Check feature in order to determine which modules have DTCs set.)
    2. Record all of the displayed DTCs, the DTC status, and the module which set the DTC.
    Did you record any DTCs in the range of U1000 to U1305?    		 -- Go to Step 4 Go to Diagnostic Aids
    4 Are the DTCs U1300, U1301 or U1305 retrieved from any module? -- Go to Step 5 Go to Step 6
    5
    IMPORTANT: Important:: Turn ON the ignition, with the engine OFF, when testing for a short to voltage. Use the DMM MIN/MAX function to capture intermittent conditions.
    Test the class 2 serial data circuit for an intermittent short to ground or an intermittent short to voltage. Refer to the following in Wiring Systems:* TESTING FOR INTERMITTENT AND POOR CONNECTIONS*TESTING FOR SHORT TO GROUND* TESTING FOR A SHORT TO VOLTAGEDid you find and correct the condition?    		 -- Go to Step 25 Go to Step 6
    6 Is U1000 the only DTC displayed in the previously specified range? -- Go to Class 2 Communication Malfunction  Go to DTC U1001 to U1254: Module U1XXX Communication 
    7 1. Turn OFF the ignition.
    2. Disconnect the scan tool from the data link connector (DLC).
    3. Inspect for poor connections at the DLC terminals 2 and 5. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS
    Did you find and correct the condition?    		 -- Go to Control Module References  for the applicable Diagnostic System Check Go to Step 8
    8 Test the DLC ground circuit terminal 5 for an open. Refer to TESTING FOR CONTINUITY
    Did you find and correct the condition?    		 -- Go to Control Module References  for the applicable Diagnostic System Check Go to Step 9
    9 1. Disconnect the splice pack SP205.
    2. Inspect for poor connections at the splice pack SP205. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS
    Did you find and correct the condition?    		 -- Go to Control Module References  for the applicable Diagnostic System Check Go to Step 10
    10 Test the class 2 serial data circuit for an open or a short between the DLC terminal 2 and the splice pack SP205 terminal A. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS
    Did you find and correct the condition?    		 -- Go to Control Module References  for the applicable Diagnostic System Check Go to Step 11
    11 1. Using the correct terminal adapter from J 35616-A, connect a jumper wire to terminal A of the splice pack SP205.
    2. Connect the other end of the jumper wire (with correct terminal adapter) to terminal M of the splice pack SP205.
    3. Turn ON the ignition, leaving the engine OFF.
    4. Attempt to communicate with the BCM.
    Does the scan tool communicate with the BCM?    		 -- Go to Step 13 Go to Step 12
    12 1. Turn OFF the ignition.
    2. Disconnect the BCM.
    3. Test the class 2 serial data circuit between the splice pack SP205 and the BCM for a short to ground or a short to voltage. (Turn ON the ignition, leaving the engine OFF, when testing for a short to voltage.) Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .
    Did you find and correct the condition?    		 -- Go to Step 25 Go to Step 23
    13 1. Leave the jumper wire connected to terminal A and to terminal M of the splice pack SP205.
    2. Connect another jumper wire from J 35616-A to the jumper wire connected to terminal A of the splice pack SP205.
    3. Connect the other end of the jumper wire (with correct terminal adapter) to terminal B of the splice pack SP205
    4. Turn ON the ignition, leaving the engine OFF.
    5. Attempt to communicate with the PCM.
    Does the scan tool communicate with the PCM?    		 -- Go to Step 15 Go to Step 14
    14 1. Turn OFF the ignition.
    2. Disconnect the PCM.
    3. Test the class 2 serial data circuit between the splice pack SP205 and the PCM for a short to ground or a short to voltage. (Turn ON the ignition, leaving the engine OFF, when testing for a short to voltage.) Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .
    Did you find and correct the condition?    		 -- Go to Step 25 Go to Step 23
    15 1. Disconnect the jumper wire from terminal B of the splice pack SP205.
    2. Connect the jumper wire to terminal E of the splice pack SP205.
    3. Turn ON the ignition, leaving the engine OFF.
    4. Attempt to communicate with the EBCM.
    Does the scan tool communicate with the EBCM?    		 -- Go to Step 17 Go to Step 16
    16 1. Turn OFF the ignition.
    2. Disconnect the EBCM.
    3. Test the class 2 serial data circuit between the splice pack SP205 and the EBCM for a short to ground or a short to voltage. (Turn ON the ignition, leaving the engine OFF, when testing for a short to voltage.) Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .
    Did you find and correct the condition?    		 -- Go to Step 25 Go to Step 23
    17 1. Disconnect the jumper wire from terminal E of the splice pack SP205.
    2. Connect the jumper wire to terminal F of the splice pack SP205.
    3. Turn ON the ignition, leaving the engine OFF.
    4. Attempt to communicate with the SDM.
    Does the scan tool communicate with the SDM?    		 -- Go to Step 19 Go to Step 18
    18 1. Turn OFF the ignition.
    2. Disconnect SDM.
    3. Test the class 2 serial data circuit between the splice pack SP205 and the SDM for a short to ground or a short to voltage. (Turn ON the ignition, leaving the engine OFF, when testing for a short to voltage.) Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .
    Did you find and correct the condition?    		 -- Go to Step 25 Go to Step 23
    19 1. Disconnect the jumper wire from terminal F of the splice pack SP205.
    2. Connect the jumper wire to terminal G of the splice pack SP205.
    3. Turn ON the ignition, leaving the engine OFF.
    Attempt to communicate with the instrument cluster.
    Does the scan tool communicate with the instrument cluster?    		 -- Go to Step 21 Go to Step 20
    20 1. Turn OFF the ignition.
    2. Disconnect the instrument cluster.
    3. Test the class 2 serial data circuit between the splice pack SP205 and the instrument cluster for a short to ground or a short to voltage. (Turn ON the ignition, leaving the engine OFF, when testing for a short to voltage.) Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .
    Did you find and correct the condition?    		 -- Go to Step 25 Go to Step 21
    21 1. Disconnect the jumper wire from terminal G of the splice pack SP205.
    2. Connect the jumper wire to terminal L of the splice pack SP205.
    3. Turn ON the ignition, leaving the engine OFF.
    Attempt to communicate with the Heater-A/C Control.
    Does the scan tool communicate with the Heater-A/C Control?    		 Go to Step 25 Go to Step 22
    22 1. Turn OFF the ignition.
    2. Disconnect the Heater-A/C Control.
    3. Test the class 2 serial data circuit between the splice pack SP205 and the Heater- A/C Control for a short to ground or a short to voltage. (Turn ON the ignition, leaving the engine OFF, when testing for a short to voltage.) Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .
    Did you find and correct the condition?    		 -- Go to Step 25 Go to Step 23
    23 Inspect for poor connections at the class 2 serial data circuit of the module that is not communicating. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .
    Did you find and correct the condition?    		 -- Go to Step 25 Go to Step 24
    24 Replace the module that is not communicating. Refer to Control Module References  for the appropriate repair instructions.
    Did you complete the repair?    		 -- Go to Step 25 --
    25 1. Reconnect all of the disconnected modules.
    2. Reconnect any other disconnected connectors.
    3. Install a scan tool.
    4. Turn ON the ignition leaving the engine OFF.
    5. Wait for 10 seconds.
    The scan tool may require a power up reset before communication will occur due to a short on the class 2 serial data circuit. Turn OFF or disconnect the scan tool prior to performing this test.
    6. Select the Display DTCs function for each module. (If using a Tech 2, use the Class 2 DTC Check feature in order to determine which modules do have DTCs set).
    7. Record all of the displayed DTCs and the DTC status.
    Did you record any DTCs that begin with a ""U"" and with a current status?    		 -- Go to Step 27 Go to Step 26
    26 Did you record any DTCs that do not begin with a ""U""? -- Go to Step 27 Go to Step 29
    27 Diagnose the DTCs as directed by the diagnostic procedures for the particular module or malfunction. Refer to Control Module References  for the applicable Diagnostic System Check.
    Did you complete the action?    		 -- Go to Step 28 --
    28 Did you diagnose all of the DTCs? -- Go to Step 29 Go to Step 27
    29 Use the scan tool in order to clear the DTCs.
    Did you complete the action?    		 -- System OK --
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