1. Battery voltage 11 - 14 V. 2. Check fuses. 3. Systems and fluid levels in order. Note: To prevent damage to the control modules referred to 23 and 24 , the connectors on the control modules must only be removed or installed with the ignition OFF . Electrical wiring diagrams: See Electric Troubleshooting Manual, Model 140, Volume 2. Diagnosis - work information: Refer to group 54.30 in SMS or in WIS

Conventional tools, test equipment

Description	Brand, model, etc.
Multimeter 1)	Fluke models 23, 83, 85, 87
Signal generator 1)	SUN DTR-8416

1) Available through the MBUSA Standard Equipment Program.