Remove/Install Active Brake Assist Electric Controller Unit - AR54.21-P-0700LWX
Model 253 (except 253.992/993) as of model year 2020 with code 258 (Active Brake Assist System)
Model 293 with code 258 (Active Brake Assist System)
Fig 1: Active Brake Assist Electric Controller Unit Components Location - Model 253 (Except 253.992/993) As Of Model Year 2020 With Code 258
| Information on preventing damage to electronic components due to electrostatic discharge | AH54.00-P-0001-01A | ||
| Notes on preventing damage to electronic components due to a magnetic tool | AH54.00-P-0002-01A | ||
| Remove/install | |||
| 1 | Commission Active Brake Assist controller unit (A108). | When replacing Active Brake Assist controller unit (A108). | |
| Model 293 with code 258 (Active Brake Assist System) | AD00.00-P-2000-06FR | ||
| Model 253 (except 253.992/993) as of model year 2020 with code 258 (Active Brake Assist System) | AD00.00-P-2000-04B | ||
| 2 | Switch off ignition and store transmitter key outside of transmission range (min. 2 m). | ||
| 3 | Remove Mercedes star. | AR88.40-P-4050LW | |
| 4 | Disconnect electrical connector (1) from Active Brake Assist controller unit (A108). | ||
| 5 | Remove Active Brake Assist controller unit (A108). | ||
| 6 | Install in the reverse order. | ||
| Check | |||
| 7 | Perform test drive and adjust the Active Brake Assist controller unit (A108) by doing so. |