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CerebralThunder

Member Since: 16 Mar 2022
Location: Midlands
Posts: 22

Auxillary Heater Water Pump

I have a problem with my auxillary heater not functioning on my 2015 L405 AB. It used to work fine, but trying it recently I noticed it didn't work.

I ran a few tests and the following errors some up:

B12A6-13 (Aux heater water pump)
B13C2-49 (Windshield misting sensor)

Click image to enlarge

I have sourced the pump (LR039070) and the misting sensor (LR058011).

The misting sensor is easy enough to replace, so I plan on changing this myself. Before I order the pump however, I thought it might be worth checking any associated fuses to make sure it's nothing 'easy'.

Could anybody elighten me as to where the fuse for the aux water heater pump is and which one it is please?

Thank you.

2nd Jan 2024 4:57pm

KILOCHARLIE

Member Since: 18 Jan 2024
Location: Wales
Posts: 9

Hi, did you ever solve this at all please? I have the same issue and codes. Thanks.

3rd Feb 2024 12:18pm

CerebralThunder

Member Since: 16 Mar 2022
Location: Midlands
Posts: 22

@kilocharlie, sorry for not getting back to you sooner..

The pump was changed, but the error still persisted and although I could now start the pre-heat from my fob, I noticed the cabin wasn't getting warm. Further investigation revealed it to be the flow/control valve below the pre-heater that was (also?) faulty.

18th Feb 2024 1:52pm

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