Code I033: Loss Of SIR Data
- 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. See Fig 1.
- An open in Yellow wire circuit from DERM terminal A3 or B3 to engine compartment fuse block fuse A11.
- An open in Black/White wire circuit from DERM terminal B1 or B 12 to ground.
- A faulty DERM.
Diagnostic Energy Reserve Module (DERM) is located directly above gas pedal and right of cruise control vacuum brake switch/stoplight switch assembly. DERM has Yellow connector and wiring harness.
- 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.
- If code I033 shows to be a history (H) code, check following for an intermittent problem. Check power sources to DERM. Check all ground connections. Check serial data circuit for intermittent open circuits. See appropriate chassis wiring diagram in WIRING DIAGRAMS section.
- If code I033 is a current (C) code, disconnect Yellow SIR connector near base of steering column. Disconnect Yellow DERM connector. Using DVOM, measure voltage at DERM harness connector terminal A8. See Figure. If voltage does not fluctuate between 3 and 5 volts, repair open in Tan wire circuit between IPC and DERM. See appropriate chassis wiring diagram in WIRING DIAGRAMS section.
- If voltage fluctuates between 3 and 5 volts, measure voltage from DERM harness connector terminals A3 and B1. If voltage is 10 volts or more, DERM is receiving good power and has a good ground. Check terminals for damage and poor contacts. If terminals are good and secure, replace DERM.
- If voltage is less than 10 volts, DERM is not receiving good power and has a faulty ground. Using DVOM, measure voltage from harness connector terminal A3 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 A3 or B3. If voltage is 10 volts or more, repair Black/White wire ground circuit from DERM terminals B1 and B12. After all repairs are completed, clear all codes and verify correct operation.