For Vehicles Produced 1/94 to 6/94:
4 Locate the black wire splice block in the splice box.
5. Match the same color wire (black) on the relay harness (P/N 61 12 8 362 049) and install the female spade lug into the splice box by carefully pressing the contact down on a free blade in the appropriate color splice block.
6. Using the proper pin removal tool (such as Special Tool 61 1 130), press out the relay connection in Pin 1 (black) of the relay socket on the new starter protection harness (P/N 61 12 8 362 049). Discard the rest of this harness; it will not be used.
7. Locate the Immobilization Device (Relay K1w). The unit is in a relay socket mounted to the front of the splice box. Remove the existing relay from the socket. Install the new pressed-out relay contact (black wire) into the Pin 1 slot on the existing vehicle harness relay socket. Continue with Step # 8.
8. Reconnect the vehicle battery, and check the relay socket with a voltmeter. There should be B+ at Pin 2 (violet/yellow) of the relay socket when the key is in the RUN position. There should be ground at Pin 4 (brown) at all times.
9. Plug in the appropriate starter protection relay:
Production Transmission Color Part Number
Prior to 1/94 ALL (man + auto) black/blue logo 61 35 8 364 174
1/94-6/94 Manual black/blue logo 61 35 8 364 174
1/94-6/94 Automatic yellow/black logo 61 35 8 364 175
*Start the engine and test for a frequency using a digital multimeter or the DIS tester at Pin 1 of the relay (measuring between the black wire and ground). At idle, this frequency should be approximately 28 Hz (for M42 engine), 35 Hz (for M50 TU engine), or 40 Hz (for M50 engine). Also verify that the tachometer is functioning properly. If these frequency readings are not attained, or if the tachometer is not functioning, check the black wire for an open circuit, a short to B+, or a short to B-. Note: If the resistor adapter (P/N 61 12 1 469 443) is not installed (E36 vehicles produced prior to 9/92 and equipped with the M50 engine) the tachometer may not function properly, even if the appropriate frequency value is attained.*
10. Mount relay assembly on available slots on front of relay bracket under steering column or side of splice box. Secure any loose harness with plastic cable ties.
10A. On vehicles equipped with automatic transmission, verify that the starter will engage only in gear selector positions "P" and "N." Any problem is an indication that the wrong relay is installed, or the wiring was added incorrectly.
11. Reinstall the splice box above the speaker. Make certain locking tabs snap firmly into place. Replace knee bolster and interior trim.