54 Chassis Electrical, Instruments

Maintenance Jobs - 1986 through 1993

• 5410 - Checking and correcting battery fluid level
• 5451 - Checking warning and indicator lamps

Maintenance Jobs - 1994 through 1995

• 5410 - Checking and correcting battery fluid level
• 5451 - Checking warning and indicator lamps

  Service Information

• 54.6 - Installation Instructions, Electric outside temperature gauge
• 54/40a - Battery jump-starting and charging
• Service Intro - Model Year 1992, Model 124 (USA), Introduction into Service
• Service Intro - Model Year 1992, 400E/500E, Introduction into Service

Additional Information

• Battery Cradle Inspection and Cleanup

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Battery, fuses

• 54-0001 - Initial filling of battery
• 54-0006 - Treatment of battery when vehicle taken out of use
• 54-0080 - Checking marten protection system (Model W124.0 up to approx 9/92)
• 54-0180 - Installing separate fuse for blower motor (up to 6/86)

Instrument panel

• 54-0242 - Overvoltage protection relay
• 54-0246 - Removing and installing odometer, <s> (up to 03/93) fehlt
• 54-0248 - Hall sensor, road speed signal with mechanical/electronic
• 54-0252 - Testing electronic speedometer. model 124.034/036

Gauges

• 54-0254 - Testing electric oil pressure gauge
• 54-0255 - Testing gauge for economic driving (ECONOMY-up to 6/90)
• 54-0256 - Function of fuel gauge sensor
• 54-0257 - Testing fuel gauge
• 54-0264 - Testing windscreen washer level indicator
• 54-0320 - Removing and installing rear dome lamp and switch
• 54-0345 - Location and identification of fuses and unfused connections
• 54-0405 - Warning device for parking brake (rental vehicles)

Battery, fuses

• 54-1030 - Testing no-load current consumption
• 54-1130 - Charging battery, testing state and capacity
• 54-1255 - Removing and installing front fuse and relay box and location of auxiliary fuse boxes
• 54-1500 - Removing and installing combination relays

Horn, modules, seat belts

• 54-1555 - Removing and installing horns of two-tone signal or fanfares
• 54-2300 - Removing and installing control units of module box (Model W124.034/.036)
• 54-2311 - Removing, installing control modules (except Model W124.034/.036)
• 54-2312 - Seat belt warning control unit <USA>

Modules, switches

• 54-2350 - Removing and installing blower motor for module box (Model W124.034/.035)
• 54-2360 - Removing and installing module box (Model W124.034/.036)
• 54-2800 - Removing and installing combination switch
• 54-3190 - Removing and installing switches in center console
• 54-3250 - Removing and installing exterior light switch

Instrument panel

• 54-5125 - Electrical connections of optional equipment
• 54-5245 - Removing and installing clock/tachometer
• 54-5320 - Removing and installing speedometer
• 54-5600 - Removing and installing speedometer shaft (except Model W124.034/.036)
• 54-6015 - Removing and installing instrument cluster

Lamps, gauges, displays

• 54-6070 - Testing operation of exterior lamp failure indicator
• 54-6075 - Removing and installing exterior lamp failure monitoring unit
• 54-6112 - Removing and installing gauges
• 54-6114 - Removing and installing function display (ASD, ASR, 4MATIC)
• 54-6320 - Testing electrical outside temperature display

Display

• 54-6341 - Removing and installing temperature sensor of outside temp display
• 54-6940 - Function of electronic brightness control of instrument lighting
  
• Programmed repairs - Electrical System I
  • Select complaint... "Economy" gauge is sluggish or does not indicate Battery discharges after vehicle parked for long periods Engine cuts out, electrical system has no voltage When engine running, bulb failure indicator lamp does not go out although no lamps are switched on Bulb failure indicator lamp does not go out when engine running and light swtched on although no lamp faulty Generator wiring harness chafing on frame side menber Bulbb failure indicator lamp lights up when using two-way radio on vehicles with two-way radio or telephone. Unsteady needle on fuel gauge, oil pressure gauge and coolant temperature gauge when ignition switched on Moisture or water in fuse and relay box Battery discharges after vehicle parked for short time Engine cuts out intermittently, runs again or only runs when started and then cuts out
• Technical modifications - Electrical System I

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