Which Mercedes R230 SL model to buy, and how to avoid a fire with CATASTROPHIC damage.....

This video starts by highlighting the main differences between the 2002-2006 R230 models SL350, SL500 and the iconic SL55.

The video explains in detail why there have been instances of the Mercedes R230 catching fire, and what you can do to avoid this potential issue in your Mercedes R230 SL. The problem is invariably linked to the battery control module overheating (part number A2305400945 and A2305401045) and we attempt to explain what leads to certain components within the BMS failing over time. Here is a link to an interesting video showing how a BCM which looks fine can have hidden problems:

BCM Mercedes R230 SL500 repair service

Here is a quick summary of how to avoid a fire in your R230 Mercedes SL:

- NEVER attempt to jump start the R230 using the rear consumer battery.
- NEVER use your R230 to jump start another vehicle without first disconnecting consumer battery.
- NEVER connect a battery charger to either battery without first disconnecting BOTH batteries.
- NEVER disconnect the starter battery before the consumer battery.
- NEVER reconnect the consumer battery before reconnecting starter battery.
- NEVER replace the starter battery with an AGM battery.
- NEVER replace the consumer battery with a standard lead acid battery.
- NEVER leave key in ignition when changing batteries.
- NEVER rely on your alternator to constantly charge a faulty consumer battery.

TOP TIP - always check that your blade key works before disconnecting your consumer battery and closing the boot/trunk.

0:00 Intro
0:45 What to look out for when buying an R230?
1:12 Visual differences between 350SL, 500SL and SL55
3:38 Engine differences between 350SL, 500SL and SL55
5:12 Kerb weight differences between 350SL, 500SL and SL55
5:50 Running costs + 2nd hand cost
6:30 Potential engine problem with 350SL
6:50 SBC brake system
8:00 Why do R230's catch fire?
9:00 What does the battery control module do?
10:05 Jump starting incorrectly can cause problems
11:33 Procedure for disconnecting and reconnecting R230 batteries
12:45 Red battery warning message
14:05 Using the correct type of AGM consumer battery
15:45 Never charge the batteries with batteries still connected
16.19 Using a cheap trickle charger....
18:20 Consumer electrics offline message
20:50 What causes BCM to catch fire
23.00 Should you buy a an R230?