Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
64 99... Reading out flashcode
TEST PRECONDITION:
Check function of independent park heater, refer to 64 12 005 CHECKING FUNCTION OF INDEPENDANT HEATING (THERMO TOP S) .
Instruction:
Connect inspection lamp to glow plug above peripherals box (pin allocation: refer to DIS circuit diagram). Switch on independent heating via MID or on-board monitor, switch off after 3 minutes running time and, once after-running time has elapsed, count the number of flash pulses.
Flashcode evaluation
| Flash Pulses | Fault Cause And Corrective Measures |
|---|---|
| 1 | Flame detector has short or break, refer to FAULT 02 FLAME DETECTOR |
| 2 | Overvoltage or undervoltage at heater, charge battery. |
| 3 | Temperature sensor has short-circuit, refer to FAULT 05 TEMPERATURE SENSOR |
| 4 | Flame detector defective (does not detect flame), refer to FAULT 02 FLAME DETECTOR |
| 5 | Flame detector defective (always detects flame), refer to FAULT 02 FLAME DETECTOR |
| None | Combustion air blower, refer to FAULT 01 COMBUSTION AIR BLOWER , or glow plug refer to FAULT 03 GLOW PLUG , or metering pump defective refer to FAULT 06 PARK HEATING METERING PUMP . |
NO RELATED
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.