Component Tests and General Diagnostics

Checking the supply voltage/ground terminal

Checking the power supply and ground terminals

Power supply, keyless vehicle module (KVM)
The keyless vehicle module (KVM) is powered via a power input on the control module.
The control module has a 30-supply from the battery via the central electronic module (CEM).
- Power input terminal #C4 (#B4) is supplied with power via a fuse from the battery.

Checking the power supply
Check the power supply cable from the battery to the engine compartment fusebox. 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.
Check the power supply cable from the engine compartment fusebox and the central electronic module (CEM) terminal #E22 (22). 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.
Check the power supply from the central electronic module (CEM) terminal #A41(41) and keyless vehicle module (KVM) terminal #C4 (#B4). Check for an open-circuit. Check for loose connections. Check for contact resistance and oxidation. Also check the fuse on the central electronic module (CEM). The voltage must be approximately battery voltage.

Ground terminal, keyless vehicle module (KVM)
The keyless vehicle module (KVM) has a ground input. The control module is grounded in the B-post on the corresponding side where the control module is installed. See the relevant wiring diagram for further information about ground terminals.
- Ground input terminal #C5 (#B5) is power ground and is connected to the ground terminal in the car body.

Checking the ground terminal
Check the ground lead between the keyless vehicle module (KVM) 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 keyless vehicle module (KVM) and the ground terminal must not be greater than 0.5 V.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Keyless Vehicle Module (KVM)
- See the relevant wiring diagram for information about circuit and ground terminals in the bodywork
- Checking wiring and terminals Checking Wiring and Terminals.

Continue - DONE

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