CHECKING THE POWER SUPPLY AND GROUND TERMINALS
Power supply, climate control module (CCM)
The climate control module (CCM) is powered via a power input on the control module.
Power input terminal #1 (#25) is +15-supplied via a relay and fuse from the central electronic module (CEM). In the event of an open-circuit, the climate and infotainment functions cannot be activated.
Checking the power supply
Check the power supply cable from the central electronic module (CEM) to climate control module (CCM) terminal #1 (#25). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage.
Ground terminal, climate control module (CCM)
The climate control module (CCM) has a ground input. The ground input from the control module is power ground and is connected to the ground terminal in the car body. See the relevant wiring diagram for further information about the ground terminal.
Checking the ground terminal
Check the ground lead between climate control module (CCM) terminal #16 (#40) and the ground terminal. Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. With the ignition on, the drop in voltage between the ground connection and the ground terminal for the climate control module (CCM) must not be greater than 0.5 V.
Remedy as necessary.
Other information
- See «CONNECTING THE BREAKOUT BOX»(ref-466633-S06630784342012042500000)
- see «SIGNAL SPECIFICATION»(ref-466634-S01544131232012042500000)
- see «CHECKING WIRING AND TERMINALS»(ref-466589-S38415998382012042500000)
Power supply, climate control module (CCM)
The climate control module (CCM) is powered via a power input on the control module.
Power input terminal #1 (#25) is +15-supplied via a relay and fuse from the central electronic module (CEM). In the event of an open-circuit, the climate and infotainment functions cannot be activated.
Checking the power supply
Check the power supply cable from the central electronic module (CEM) to climate control module (CCM) terminal #1 (#25). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage.
Ground terminal, climate control module (CCM)
The climate control module (CCM) has a ground input. The ground input from the control module is power ground and is connected to the ground terminal in the car body. See the relevant wiring diagram for further information about the ground terminal.
Checking the ground terminal
Check the ground lead between climate control module (CCM) terminal #16 (#40) and the ground terminal. Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. With the ignition on, the drop in voltage between the ground connection and the ground terminal for the climate control module (CCM) must not be greater than 0.5 V.
Remedy as necessary.
Other information
- See «CONNECTING THE BREAKOUT BOX»(ref-466633-S06630784342012042500000)
- see «SIGNAL DESCRIPTION»(ref-466634-S36738185222012042500000)
- see «CHECKING WIRING AND TERMINALS»(ref-466589-S38415998382012042500000)
CONNECTING THE BREAKOUT BOX
Special tools
see 9511463
see 9813190
- Ignition off
- see «CLIMATE CONTROL MODULE (CCM)»(ref-466635-S16778414152012042500000) (2008-09) and «CLIMATE CONTROL MODULE (CCM)»(ref-466635-S07815348062012042500000) (2005-11)
Connect breakout box see 9813190 to the adapter.
Climate control module (CCM)
- Connect adapter see «9511463»(ref-460875-S37881146052012033000000) to the control module connector A
- For connector A, terminals #A1-#A16 correspond to terminals #25-#40 on the breakout box.
CHECKING THE SUPPLY VOLTAGE/GROUND TERMINAL
Power supply, combustion preheater module (CPM)
The combustion preheater module (CPM) is powered via a power input on the control module.
When the ignition is on, the power input is powered and the combustion preheater module (CPM) is in active mode.
- Power input terminal 1 (#A1) is powered via a fuse from the central electronic module (CEM). The combustion preheater module (CPM) will not be activated if there is an open-circuit.
Checking the power supply
Check the power supply cable from the battery to the central electronic module (CEM) and from the central electronic module (CEM) to the combustion preheater module (CPM) (#A1). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage when the ignition is on.
Ground terminal, combustion preheater module (CPM)
The combustion preheater module (CPM) has a ground input. The ground input from the control module is connected via a ground lead to the ground terminal in the car body.
- Ground input terminal 1 (#A2) is power ground and is connected to the ground terminal in the car body.
Checking the ground terminal
Check the ground lead between the combustion preheater module (CPM) (#A2) and the ground terminal. Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. With the ignition on, the drop in voltage between the ground connection for the combustion preheater module (CPM) and the ground terminal must not be greater than 0.5 V.
Remedy as necessary.
Other information
- see «SIGNAL SPECIFICATION»(ref-466634-S28255688992012042500000)
- see «CONTENTS»(ref-466589-S05251896242012042500000)
