Theft Deterrent System

THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: TERMINALS OF ECU

1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)





(a) Disconnect the E29 and E30 ECU connectors.

(b) Measure the resistance and voltage according to the value(s) in the table below.





* If the result is not as specified, there may be a malfunction on the wire harness side.

(c) Reconnect the E29 and E30 ECU connectors.

(d) Measure the voltage according to the value(s) in the table below.





* If the result is not as specified, the ECU may have a malfunction.

2. CHECK MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)





(a) Disconnect the 2A, 2B, 2D, and E3 ECU connectors.

(b) Measure the voltage and resistance according to the value(s) in the table below.





If the result is not as specified, there may be a malfunction in the wire harness.

(c) Reconnect the 2A, 2B, 2D, and E3 ECU connectors.

(d) Measure the voltage of the connectors.









If the result is not as specified, the ECU may have a malfunction.

(e) Using an oscilloscope, check waveform 1.





Waveform 1 (Reference)





(f) Using an oscilloscope, check waveform 2.





Waveform 2 (Reference)





(g) Using an oscilloscope, check waveform 3.





Waveform 3 (Reference)





(h) Using an oscilloscope, check waveform 4.





Waveform 4 (Reference)





(i) Using an oscilloscope, check waveform 5.





Waveform 5 (Reference)





(j) Using an oscilloscope, check waveform 6.





Waveform 6 (Reference)





(k) Using an oscilloscope, check waveform 7.





Waveform 7 (Reference)





(l) Using an oscilloscope, check waveform 8.





Waveform 8 (Reference)





(m) Using an oscilloscope, check waveform 9.





Waveform 9 (Reference)





(n) Using an oscilloscope, check waveform 10.





Waveform 10 (Reference)





(o) Using an oscilloscope, check waveform 11.





Waveform 11 (Reference)





(p) Using an oscilloscope, check waveform 12.





Waveform 12 (Reference)





(q) Using an oscilloscope, check waveform 13.





Waveform 13 (Reference)





(r) Using an oscilloscope, check waveform 14.





Waveform 14 (Reference)





(s) Using an oscilloscope, check waveform 15.





Waveform 15 (Reference)





(t) Using an oscilloscope, check waveform 16.





Waveform 16 (Reference)





(u) Using an oscilloscope, check waveform 17.





Waveform 17 (Reference)





(v) Using an oscilloscope, check waveform 18.





Waveform 18 (Reference)





(w) Using an oscilloscope, check waveform 19.





Waveform 19 (Reference)





(x) Using an oscilloscope, check waveform 20.





Waveform 20 (Reference)





(y) Using an oscilloscope, check waveform 21.





Waveform 21 (Reference)





(z) Using an oscilloscope, check waveform 22.





Waveform 22 (Reference)





(aa) Using an oscilloscope, check waveform 23.





Waveform 23 (Reference)





(ab) Using an oscilloscope, check waveform 24.





Waveform 24 (Reference)