Hey all,
I'm doing some fault clearing on my 508 and I can't seem to get rid of this one on the BSI.
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B132A : Air conditioning circuit low pressure safety fault
Characterisation : Signal below the tolerance range
Status : Temporary
Location : local
Variables associated with the fault
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Can anyone help with interpretation of this? Is this a low refrigerant fault?
B132A : Air conditioning circuit low pressure safety fault
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Re: B132A : Air conditioning circuit low pressure safety fault
Yes, this fault means there is an A/C circuit low pressure safety fault, so it has declutched the compressor for safety reasons. The signal is below the tolerance range.
Whilst this is in effect the A/C will be cut off. Your suspect areas are going to be the Air conditioning pressure sensor or the electrical harness.
Whilst this is in effect the A/C will be cut off. Your suspect areas are going to be the Air conditioning pressure sensor or the electrical harness.
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Marc
Marc
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Re: B132A : Air conditioning circuit low pressure safety fault
Thanks Marc,
You are really my go to at the moment
Replacement of the pressure sensor would require breaking into the refrigerant circuit right?
You are really my go to at the moment
Replacement of the pressure sensor would require breaking into the refrigerant circuit right?
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Re: B132A : Air conditioning circuit low pressure safety fault
When the pressure of the air conditioning fluid is below 2.5 bar, the air conditioning compressor is cut off.
The air conditioning compressor is triggered again when the air conditioning fluid pressure increases to above 3 bar.
So it might be worth getting the system checked and get an A/C recharge first to see if there is a leak or it's low on refrigerant. It might just be that.
But in case you need to check the sensor, the pressostat is located here - I have marked it with a green arrow:
The air conditioning compressor is triggered again when the air conditioning fluid pressure increases to above 3 bar.
So it might be worth getting the system checked and get an A/C recharge first to see if there is a leak or it's low on refrigerant. It might just be that.
But in case you need to check the sensor, the pressostat is located here - I have marked it with a green arrow:
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Marc
Marc
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Re: B132A : Air conditioning circuit low pressure safety fault
I ran diagnostics with Ediag Kingbolen and it showed fault code for fan P0495 and P0494, both intermittent, fanspeed is not correct/no speed, wiring is shorted to earth, battery or open circuit. And B132A (intermittet), low ac circuit pressure.Yellow Service light is on with 3 beeps.
Does low ac circuit pressure mean low refrigerant? Can low refrigerant cause P0495 and P0494? What's the relationship? Can all these faults be caused by being hit by another object/car?
Does low ac circuit pressure mean low refrigerant? Can low refrigerant cause P0495 and P0494? What's the relationship? Can all these faults be caused by being hit by another object/car?
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Re: B132A : Air conditioning circuit low pressure safety fault
Here are the fault code descriptors for you:
Of course, if there is a leak in the A/C circuit it will cause loss of gas / pressure. However if you look at fault P0495, you will see that one of the downgrade modes is disengagement of the A/C compressor whilst this fault is active.
It may well be that you have a fault in the fan / fan assembly.
Of course, if there is a leak in the A/C circuit it will cause loss of gas / pressure. However if you look at fault P0495, you will see that one of the downgrade modes is disengagement of the A/C compressor whilst this fault is active.
It may well be that you have a fault in the fan / fan assembly.
Fault Code: | P0494 |
Description of Fault: | 2 speed cooling fan: Incoherence between the reference value (low speed) and the status of the fan assembly. Incoherence between the reference value (low speed) and the status of the fan assembly (For 5 seconds). |
Conditions for Fault to clear: | Activation of the cooling fans unit |
Downgrade Modes whilst Fault is active: | - |
Symptoms: |
|
Suspect Areas: |
|
Fault Code: | P0495 |
Description of Fault: | 2 speed cooling fan: Incoherence between the reference value (high speed) and the status of the fan assembly. Incoherence between the reference value (high speed) and the status of the fan assembly (For 5 seconds). |
Conditions for Fault to clear: | Activation of the cooling fans unit |
Downgrade Modes whilst Fault is active: |
|
Symptoms: |
|
Suspect Areas: |
|
Please Don't PM Me For Technical Help
Marc
Marc
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Re: B132A : Air conditioning circuit low pressure safety fault
There is also a horn fault code B1156. It is described as short circuit in engine wiring house. Is it a coincidence or does it point to a common fault that both the horn fault and the cooling fan fault have short circuit in wiring harness? Does horn wiring and cooling fan wiring share same harness? Do you have electrical diagram or can you guess the cause and how to repair? Can 'Risk-of-dpf-clogging' or limp mode stress or heat up the cooling fan or electrical wirings to the point of failure?
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Re: B132A : Air conditioning circuit low pressure safety fault
There are 2 parts of the code missing. There should be 2 more digits at the end, so could be any of these three:
Fault Code: | B1156 11 |
Description of Fault: | Horn fault: Short circuit to earth. Horn operated. Short-circuit to earth detected for 2 seconds. |
Conditions for Fault to clear: |
|
Downgrade Modes whilst Fault is active: |
|
Symptoms: |
|
Suspect Areas: |
|
Fault Code: | B1156 12 |
Description of Fault: | Horn fault: Short circuit to positive. Horn not controlled. Short-circuit to positive detected for 2s. |
Conditions for Fault to clear: |
|
Downgrade Modes whilst Fault is active: | - |
Symptoms: |
|
Suspect Areas: |
|
Fault Code: | B1156 13 |
Description of Fault: | Horn fault: Open circuit. Horn not controlled. Open circuit detected for 2 seconds. |
Conditions for Fault to clear: |
|
Downgrade Modes whilst Fault is active: | - |
Symptoms: |
|
Suspect Areas: |
|
Please Don't PM Me For Technical Help
Marc
Marc
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Re: B132A : Air conditioning circuit low pressure safety fault
I looked through the grill and other openings but I can't see any horn. Do you have electric diagram for horn and cooling fan so I can trace the cables from fuse or relay box to them and test with multimeter where is the short or open circuit? Do you know where are the relays and fuses for horn and cooling fan?