LI82.20-P-075747

Service Bulletin Details

Public Details for: LI82.20-P-075747

Complaint the "ambient light warning assistance inoperative" warning message is displayed in the instrument cluster and the light-emitting diode strips are not working. This message is set by the active ambient lighting control unit (n16


- 2023 - 2022 - 2021 -

Ambient Light Warning Assistance Inoperative Message In Cluster
Topic number
LI82.20-P-075747
Version
1
Function group
82.20 - Interior lights
Date
1/10/23
Validity
Model series 223 with code 878
Model series 295 with code 878
Model series 296 with code 878
Model series 297 with code 878
Reason for change
Model series validity supplemented.
Complaint
The "Ambient Light Warning Assistance Inoperative" warning message is displayed in the instrument cluster and the
light-emitting diode strips are not working.
This message is set by the active ambient lighting control unit (N162/1), when a light-emitting diode strip is missing or
where a fault is detected in the light-emitting diode strip.
Cause
The following causes are possible:
1. Rework in active ambient lighting area. The ambient lighting is switched on and the connectors are disconnected
from the wiring harness.NO fault code is stored.
2. Fault code 123X87 (communication error) is stored in the active ambient lighting control unit (N162/1) and an lightemitting diode strip (E34/1-6) is displayed in the quick test with ! (exclamation mark)..
3. Fault code 186X00 (malfunction) stored in the light-emitting diode strips (E34/1-6).
4. Fault code 186x98 (overtemperature) stored in light-emitting diode strips (E34/1-6).
5. There are no fault codes stored in the active ambient lighting control unit (N162/1) and in the light-emitting diode
strips (E34/1-6).
Remedy
1. Lock and unlock vehicle to reset the active ambient lighting control unit (N162/1).
IMPORTANT: When locking, the visual locking verification signal must be visible. Make sure that all the doors are
shut. After locking, wait until the instrument cluster switches to OFF, then press unlock.
2. Run guided test as per XENTRY Diagnosis (check electric lines and connectors). If no faults are found in the
electrical check, please conduct the following:
10.01.2023 15:27:40
© Copyright Mercedes-Benz AG
JKANTAR
Page 1 / 2
Replace light-emitting diode strip E34/4 -> light-emitting diode strip. Only valid for model series 223.
LED strip E34/1, E34/2, E34/3, E34/4, E34/5 and E34/6 -> Create TIPS case. Please note if message in cluster is yellow or white in color.
3.-5. Update software of light-emitting diode strips (E34/1-6) and active ambient lighting control unit (N162/1):
•
•
•
Software update for light-emitting diode strips (E34/1-6)
Software update for active ambient lighting control unit (N162/1). If the latest software is not available, perform
SCN coding (IMPORTANT: Do not perform until after the software update for the light-emitting diode strips has
been implemented).
Perform remedy point 1 (lock and unlock vehicle) as described.
6. If points 1. - 3. do not provide a remedy, create a TIPS case. Please note if message in cluster is yellow or white in
color.
Symptoms
Lighting > Interior illumination > Ambiance illumination > Does not go on
Operation numbers/damage codes
Op. no.
Operation text
10.01.2023 15:27:40
© Copyright Mercedes-Benz AG
Time
JKANTAR
Damage
code
Note
Page 2 / 2


© dot.report 2024

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.