Checking Wiring Harness - AR54.18-P-0600-01A

WARNING: This page is about a different car, the 2020 Mercedes-Benz SLC43 AMG, 2019 Mercedes-Benz SLC43 AMG, 2018 Mercedes-Benz SLC43 AMG, and 2017 Mercedes-Benz SLC43 AMG. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Electrical Connection Kit (220 589 00 99 00)

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying 126-Pin Socket Box (129 589 00 21 00)

Courtesy of MERCEDES-BENZ USA

During tests on the supplemental restraint system control unit a corresponding test cable must be used in combination with the 126-pin socket box.

Connect electrical connection kit with test cable.
Check lines for resistance using a continuity meter as per the wiring diagram, starting at the corresponding control unit.
The resistance must be < 0.5 Q.
Perform system test in accordance with diagnosis specifications.