The dreaded slow battery drain is back. Just shoot me. 
Replaced a weak battery 12 months ago when the '02 S430 would slow drain over the weekend, and it helped - until recently.
Now I've got an intermittent drain on my daily driver. Got a nice Black and Decker Jump pack so it hasn't let me sit - yet.
An electronic Battery test at Autozone this week showed that it was good and holding a charge after a long drive. Running voltage from the Climate Control module shows 14.0 VDC, which confirms to me that the alternator and voltage regulator are working.
All of the door windows, seats, sunroof, etc work fine.
Which makes me suspect the dreaded CANbus network problem that either CANbus will not go to sleep when the car is shut off and the doors closed.
Checked all the lights at night to ensure that no lights were left on, and removed the Navi CD for the time being.
Called up the Diagnostic errors on the Command Console, and got the following - none of which were showing as active faults:
B1010 The supply voltage of the control unit is too low (3 times)
B1762 Fault in CAN communication with A40/3n2 (Navigation processor) (1 time)
B1780 Fault in CAN communication with Instrument Cluster (5 times)
The D2B (fiberoptic network) does not show any programming mismatch shown in the photo below for the Command system.
The voltage too low is probably a symptom of the battery draining. Only one hit for the Navi processor does'nt worry me too much. 5 Hits on the Instrument Cluster makes me suspicous. However, the cluster turns off and 'goes to sleep' when the car is shut down.
Before I make a boat payment for the dealer or an indie and shovel money at them to easter egg a diagnosis, any input from the forum?
A photo of the diagnostic functions of Climate Control (battery voltage) and Command Console is shown below. As an aside, found out you can get German language titles on the Climate Control diagnostic panel by holding down both the Rest and 'O' buttons. (U-Batterie)
Thanks in advance for advice
**UPDATE - After reading so many posts about problems with slow battery drain, and suffering the same fate, thought I would dump all my lessons learned into a DIY troubleshooting guide that is attached on Post #21.
If anyone wants to add their experience to this generic guide, please post and I will revise.
Many thanks to Streetglower for getting me on the right track to solve the problem! :bowdown:
Replaced a weak battery 12 months ago when the '02 S430 would slow drain over the weekend, and it helped - until recently.
Now I've got an intermittent drain on my daily driver. Got a nice Black and Decker Jump pack so it hasn't let me sit - yet.
An electronic Battery test at Autozone this week showed that it was good and holding a charge after a long drive. Running voltage from the Climate Control module shows 14.0 VDC, which confirms to me that the alternator and voltage regulator are working.
All of the door windows, seats, sunroof, etc work fine.
Which makes me suspect the dreaded CANbus network problem that either CANbus will not go to sleep when the car is shut off and the doors closed.
Checked all the lights at night to ensure that no lights were left on, and removed the Navi CD for the time being.
Called up the Diagnostic errors on the Command Console, and got the following - none of which were showing as active faults:
B1010 The supply voltage of the control unit is too low (3 times)
B1762 Fault in CAN communication with A40/3n2 (Navigation processor) (1 time)
B1780 Fault in CAN communication with Instrument Cluster (5 times)
The D2B (fiberoptic network) does not show any programming mismatch shown in the photo below for the Command system.
The voltage too low is probably a symptom of the battery draining. Only one hit for the Navi processor does'nt worry me too much. 5 Hits on the Instrument Cluster makes me suspicous. However, the cluster turns off and 'goes to sleep' when the car is shut down.
Before I make a boat payment for the dealer or an indie and shovel money at them to easter egg a diagnosis, any input from the forum?
A photo of the diagnostic functions of Climate Control (battery voltage) and Command Console is shown below. As an aside, found out you can get German language titles on the Climate Control diagnostic panel by holding down both the Rest and 'O' buttons. (U-Batterie)
Thanks in advance for advice
**UPDATE - After reading so many posts about problems with slow battery drain, and suffering the same fate, thought I would dump all my lessons learned into a DIY troubleshooting guide that is attached on Post #21.
If anyone wants to add their experience to this generic guide, please post and I will revise.
Many thanks to Streetglower for getting me on the right track to solve the problem! :bowdown: