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WC35 - Checking Relays for Engine-Compartment Blower (Workshop Campaign)

Vehicle Type:

911 Carrera (991)/911 Carrera S (991) – Cabriolet

Model Year:

2012

Concerns:

Relay for engine-compartment blower

Revision 1:

July 3, 2012, “or equivalent “ was added to the Deutronic Battery Charging Computer listed under
“Tools”.

Information:

This is to inform you of a voluntary Workshop Campaign on the above-mentioned vehicles. There is the
possibility that the relay for setting 1 of the engine-compartment blower is not inserted correctly in the
relay carrier on the affected vehicles. If the relay is not inserted correctly, the function of setting 1 of the
engine-compartment blower cannot be guaranteed and the driver will see a warning to this effect in the
multi-function display. To remedy the situation, check that the engine-compartment blower relay is seated
correctly in the relay carrier.

Affected
Vehicles:

The VIN(s) can be checked by using PIWIS Vehicle Information link to verify if the campaign affects the
vehicle. This Campaign is scope specific to the VIN! Failure to verify in PIWIS may result in an improper
repair.

Parts Info:

Only required if the flat plugs of the relay are damaged:
999.657.014.90

⇒ Relay for engine-compartment blower

Tools:

PIWIS Tester II 9818
Deutronic Battery Charging Computer DBL1600-14 1391 or equivalent

Work
Procedure:

See Attachment “A”.

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As many as required
(max. 2)

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Procedure:

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See Attachment “B”.
Information
The engine-compartment blower relays to be checked are in relay carrier 2 close to the right convertible
top mechanism, between the roll-over protection system frame and the engine bulkhead ⇒ Installation
position of relays for engine-compartment blower.

Installation position of relays for engine-compartment blower
Attachment "A": Work Procedure
Check relays for engine-compartment blower.
1

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Release relay carrier ⇒ Workshop Manual ’9790IN Loosening and securing relay carrier - section on
"Removing"’.

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Remove both engine-compartment blower relays ⇒
Figure 1 -2- from the relay carrier ⇒ Figure 1 -2-.

1

2

Figure 1
3

Check both engine-compartment blower relays.
If one of the flat plugs on the relay is bent ⇒ Figure 2
-arrow-, the relay must be replaced.

Figure 2
If a flat plug is bent, check the plug sockets in the
relay carrier ⇒ Figure 3 -arrow - for deformation
and bend them into shape again using a suitable tool
if necessary.

Figure 3

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4

Press both engine-compartment blower relays ⇒
Figure 4 -1- into the defined slot on the relay carrier
⇒ Figure 4 -2- and check that they are seated
correctly.

5

Secure relay carrier ⇒ Workshop Manual ’9790IN
Loosening and securing relay carrier - section on
"Installing"’

1

2

Figure 4
Procedure:

Perform on-board diagnosis on relays for engine compartment purge fan.
1

Preliminary work.
1.1

Connect a battery charger with a current
rating of at least 40 A.
First connect the positive cable of the charger
to the positive terminal of the battery and then
connect the negative cable of the charger
to the ground point for jump-lead starting
⇒ External power connection.

1.2

PIWIS Tester II 9818 must be connected to
the vehicle communication module (VCI).
Then, connect the communication module
to the vehicle and switch on the PIWIS Tester.

1.3

On the PIWIS Tester start screen, call up the
⇒ ’Diagnostics’ menu and select the vehicle
type.
The diagnostic application is then started and
the control unit selection screen is populated.

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Perform drive links test on engine compartment
purge fan setting 1 and setting 2.

External power connection

2.1

In the control unit selection screen ⇒ ⇒’Overview’ menu), select “DME” control unit and
press •F12“ to confirm your selection.

2.2

Skip the question as to whether you want to create a vehicle analysis log (VAL) by pressing
•F11“.

2.3

Once the DME control unit has been found, select the ⇒ ’Drive links/checks’ menu.

2.4

Select the ⇒ ’Drive links’ function and press •F12“ to confirm.

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2.5

Select drive link ⇒’Engine compartment purge fan setting 1 (Low)’ and press •F12“ to
confirm your selection.

2.6

Start drive link for engine compartment purge fan setting 1 (Low)’ by pressing •F8“
(“Execute”).
Both engine compartment purge fans are activated and the value ’100%’ appears in the
’Results’ field. Activation of the engine compartment purge fan is signalled acoustically.

3

2.7

Once the test is completed successfully, replace the value ’100%’ with the value ’0%’ and
continue by pressing •F8“ to stop the activation of the drive links.

2.8

As soon as the drive links test on engine compartment purge fan setting 1 (Low) has
been completed, press •F11“ to go back and perform the drive links test on engine
compartment purge fan setting 2 (High) in accordance with Steps 2.5 to 2.7.

2.9

Once the drive links test is completed successfully, press •F11“ to return to the control unit
selection screen (⇒ ’Overview’ menu).

Read out and erase fault memories.
3.1

In the control unit selection screen (⇒ ’Overview’ menu), press •F7“ to call up the Additional
menu.

3.2

Select the function ⇒ ’Read all fault memories and erase if required’ and press •>>“
to confirm.
The fault memories of the control units are read out.

3.3

Once you have read out the fault memories, erase the fault memory entries by pressing
•F8“.

3.4

Press •F12“ (“Yes”) in response to the question as to whether you really want to erase all
fault memory entries.
The faults stored in the fault memories of the various control units are deleted.
Information
If control units are found to have faults, which cannot be erased and are not associated with
checking the engine-compartment blower relay, these faults must be found and corrected.
This work cannot be invoiced under the workshop campaign number.

3.5

4

Once you have erased the fault memories, select the ⇒ ’Overview’ menu and press •