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Code I033 Loss Of SIR Data

  1. If this code is set with Codes I034, I037, E047 and A037, see MULTIPLE DATA COMMUNICATION CODES. If this code sets by itself, IPC is not able to exchange data with DERM. IPC will also display SERVICE SUPPLEMENTAL RESTRAINTS message. Problem will be one of following:
    • An open in Tan wire circuit between IPC and DERM and a second open between DERM and ACP.
    • An open in Yellow wire circuit from DERM terminal A9 or A10 to engine compartment fuse block fuse A11.
    • An open in Black/White wire circuit from DERM terminal A1 or A12 to ground.
    • A faulty DERM. Diagnostic Energy Reserve Module (DERM) is located above brake pedal. DERM has Yellow connector and wiring harness.
  2. Turn off ignition and wait for 5 seconds. Turn ignition on and notice inflatable restraint warning light. If warning light does not flash 7-9 times and then go out, see SYSTEM OPERATION CHECK in appropriate AIR BAG RESTRAINT SYSTEM article. If warning light performs normally, enter self-diagnostics.
  3. If Code I033 is a current (C) code, go to next step. If Code I033 is a history (H) code, check for intermittent problems in power and ground circuit circuits of DERM and in serial data circuit. See WIRING DIAGRAMS  .
  4. Disconnect Yellow SIR connectors near base of steering column and behind glove box trap door. Disconnect Yellow DERM connector. Using DVOM, measure voltage at DERM harness connector terminal A11. See Figure . If voltage does not fluctuate between 3 and 5 volts, repair open in Tan wire circuit between IPC and DERM. See WIRING DIAGRAMS  .
  5. If voltage fluctuates between 3 and 5 volts, measure voltage between DERM harness connector terminals A1 and A9. If voltage is 12 volts or more, go to step 7). If voltage is less than 12 volts, go to next step.
  6. Using DVOM, measure voltage from harness connector terminal A9 to ground. If voltage is less than 10 volts, repair short in Yellow wire power circuit from engine compartment fuse block fuse A11 to DERM terminal A9 or A10. If voltage is 10 volts or more, repair Black/White wire ground circuit from DERM terminals A1 and A12. After all repairs are completed, clear all codes and verify correct operation.
  7. Using a DVOM, measure resistance between DERM connector terminal A1 and battery ground. If resistance is greater than one ohm, repair Black/White wire. If resistance is less than one ohm, check for proper terminal contact at connector. If terminals are good and secure, replace DERM.
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