LI46.35-N-076604
Service Bulletin Details
Public Details for: LI46.35-N-076604
Various concerns in relation to electric power steering including rattling/humming noise from electric power steering when steering fully turned (see video recordings 01 and 02).
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Electric Power Steering Diagnosis Topic number LI46.35-N-076604 Version 1 Function group 46.35 - Electrical steering Date 7/11/23 Validity Model 447 Model 907 except code ZG1 (Engageable all-wheel drive) and except code ZG3 (Engageable all-wheel drive with transmission ratio) Reason for change Complaint Various concerns in relation to electric power steering including Rattling/humming noise from electric power steering when steering fully turned (see video recordings 01 and 02). Attachments File Description 01.mp4 Noise on underbody from electric power steering when steering fully turned. 02.mp4 Noise in vehicle from electric power steering when steering fully turned. Cause 1. 2. 3. • Check vehicle history for repairs in relation to front of vehicle or wheel damages Inspect wheels, suspension and steering gear for damages as shown in example pictures below. If no physical damages are found during inspection, pull the boots back to inspection for signs of corrosion/water or damages. If the presence of water is found inside the boots or rack, in combination with no physical outer damage, this is a sign of the vehicle being used in high water situations and will not be warrantable. NOTE: • • • Please review AH46.20-P-9409-01A for vehicles that have been in an accident Please review AP46.00-D-4650TS Check condition of steering mechanism Please review attached Steering Gear Diagnosis presentation from 2021 NDTD Ball screw drive (KGT) of electric power steering damaged by: • 1. External force due to: Hitting a curb or post with the front wheels. 11.07.2023 05:49:20 © Copyright Mercedes-Benz AG Page 1 / 5 2. Driving over obstacles (e.g. pothole/ threshold/ speed bump/ gully) at an inappropriate speed. • 1. Corrosion / water ingress due to damaged boot: Cracks (see picture 03). 2. High pressure cleaner (see picture 04). 3. Animal bite (see picture 05). 4. Defective retaining clamp (see picture 06). Attachments File Description 03.jpg Corrosion / water ingress due to damaged boot (cracks). 11.07.2023 05:49:20 © Copyright Mercedes-Benz AG Page 2 / 5 04.jpg Corrosion / water ingress due to damaged boot (high pressure cleaner). 05.jpg Corrosion / water ingress due to damaged boot (animal bite). 06.jpg Corrosion / water ingress due to damaged boot (defective retaining clamp). Steering Gear Diagnosis NDTD2021.pdf Steering Gear Diagnosis- NDTD2021 WIS-References Document number Title Note AH46.20-P-9409-01A Evaluating steering gear when repairing accident vehicles all models AP46.00-D-4650TS Check condition of steering mechanism all models Remedy *********************************************************************************************************************** 11.07.2023 05:49:20 © Copyright Mercedes-Benz AG Page 3 / 5 Note: The replacement of component parts (I.E. replacement of electric power steering) or the invoicing of material costs or wage costs through warranty or goodwill in combination with any improper use of the vehicle or any external damage is not permitted. *********************************************************************************************************************** 1. Replace electric power steering. Information: See AR46.20-S-0500E for model 447 with engine 274 See AR46.20-D-0500TS for model 907 except code ZG1 (Engageable all-wheel drive) and except code ZG3 (Engageable all-wheel drive with transmission ratio) WIS-References Document number Title Note AR46.20-D-0500TS Remove/install steering gear Model 907 except code ZG1 (Engageable all-wheel drive) and except code ZG3 (Engageable all-wheel drive with transmission ratio) AR46.20-S-0500E Remove/install steering gear Model 447 with engine 651, 654.9 except code ZG2 (Permanent all-wheel drive) Model 447, 448 with engine 274 Symptoms Chassis/suspension > Noises > Humming/droning/throbbing Chassis/suspension > Noises > Vibrates Chassis/suspension > Noises > Grunting Chassis/suspension > Steering system > Noises > Chattering/knocking Chassis/suspension > Steering system > Noises > Humming/vibrations Parts Part number ES1 ES2 Designation Quantity Note EPC - Additional necessary replace- 1 ment part scopes, small parts, workshop equipment or consumable materials must be replaced according to the information in the repair documents referred to in this document. These are to be determined according to the vehicle identification number (VIN) through the XENTRY Portal Parts Information system. X - Additional necessary replace- ment part scopes, small parts, workshop equipment or con- X 11.07.2023 05:49:20 © Copyright Mercedes-Benz AG Page 4 / 5 sumable materials must be replaced according to the information in the repair documents referred to in this document. These are to be determined according to the vehicle identification number (VIN) through the XENTRY Portal Parts Information system. Operation numbers/damage codes Op. no. Operation text Time Damage code Note 4648638 Rack-and-pinion steering sealing boot – loose Note: Only for the case that the customer complaint does not involve any improper use of the vehicle or external damage. The listed damage code is not to be considered as an acceptance of costs. The general guidelines in the Warranty Manual apply. 463013 Replace electric power steering --- Information: Model 907 463406 Replace electric power steering --- Information: Model 447 11.07.2023 05:49:20 © Copyright Mercedes-Benz AG Page 5 / 5