Codes 5/33221, 5/33271, 5/33222 and 5/33272

Electrically heated rear window and electrically heated door mirrors - testing

Fault symptom

Permanent: 53221
Intermittent: 33221

Conditions
Open circuit or short circuit to +12 V (pin 11) when electrically heated rear window is off. (version 2.01)

Fault symptom

Permanent: 53271
Intermittent: 33271

Conditions
Short circuit to ground (pin 11) with electrically heated rear window on. (version 2.01)

Fault symptom

Permanent: 53222
Intermittent: 33222

Conditions
Short circuit to 12 V (pin 31) only with ECON connected. (version 2.01)

Fault symptom

Permanent: 53272
Intermittent: 33272

Conditions
Short circuit to ground (pin 31) only with AUTO engaged. (version 2.01)







Electrically heated rear window and electrically heated door mirrors - testing

Action
1 Check the fuse in the power supply (to electrically heated rear window).
2 Check if supply is received at electrically heated rear window when it is manually switched on.
3 If no supply is received at the electrically heated rear window, check the signal to the window on the ACC control module.
4 If there is no fault with the signal, the fault is in the relay or its associated wiring harness.
5 If the signal from the ACC control module is incorrect, carefully check connections in the ACC control module connector and then try a new ACC control module.


Signal levels

Signal ACC pin Status Voltage
measured
Electrically 11 & On 12 V
heated ground Off 0 V
rear win-
dow etc
A/C 31 & AUTO on 12 V
ground
A/C 31 & ECON 0 V
ground