Auto Check System Symbols and Components
Following Symbols are Displayed:
Brake fluid level too low Operating pressure of power brake below 120 bar (1740 psi) Hydraulic fluid level too low
Engine oil pressure below 1.8 bar (26 psi) RPM over 2000 Engine oil pressure below 0.3 bar (4 psi)
Coolant temp. above 120~C (248~F)
Brake light not operating (fuse, switch, wire)
Wear limit on front brake pads (pad thickness without backing plates approx. 2 mm (0.080 in.)
Headlight low beam, or taillight not operating (fuse, switch, wire)
Battery voltage below 10.6 volts or above 15.6 volts
Fluid level of windshield washer tank too low
Fuel left in tank, 12 Liters (approx. 3 gal.)
No failure
FIGURE 1:
Brake fluid level sending unit
FIGURE 2:
Coolant level sending unit
FIGURE 3:
Coolant temp. sending unit
FIGURE 4:
Windshield washer level sending unit
FIGURE 5:
Hydraulic fluid level sending unit
FIGURE 6:
Brake pressure sending unit
FIGURE 7:
Connector for brake pad wear indicator, wear limit sensor integrated in brake pad
FIGURE 8:
Oil pressure sending units A - oil pressure switch (white) 1.8 bar (26 psi) B - oil pressure switch (brown) 0.3 bar (4 psi)
FIGURE 9:
Front bulb control unit auxiliary relay panel, under dash panel on left side, socket 5
FIGURE 10:
Display unit behind instrument cluster
FIG. 11:
Check System control unit, behind center console
FIG. 12:
Rear bulb control unit, trunk compartment, left side
FIG. 13:
Display unit, 8 point connection 1 - Battery 2 - Oil pressure 3 - Brake pad wear 4 - Voltage supply 5 - Voltage red triangle 6 - Red triangle (negative) 7 - OK 8 - Not connected
FIG. 14:
Display unit, 6 point connection 1 - Brake fluid 2 - Low beam/taillight 3 - Brake light 4 - Fuel 5 - Windshield washer 6 - Coolant
FIG. 15:
FIG. 13:
FIG. 14:
Display unit lights, checking, measure with Ohmmeter between contact 4 of 8 point connection and contacts 1, 2, 3, and 7, also on 6 point connection contact 1, 2, 3, 4, 5, and 6 spec's 2.5-3.5 Ohms if not, replace bulb carrier
FIG. 16:
Red triangle light, checking, measure with Ohmmeter between contact 5 and 6 of 8 point connection spec's 2.5-3.5 Ohms if not, replace bulb carrier
FIG. 17:
Bulb carrier, removing
FIG. 18:
Bulb carrier, installing
FIG. 19:
Wire connector for main control unit, 35 point
1 - Ignition switch, contact 50 2 - Oil pressure switch 1.8 bar (26 psi) 3 - Oil pressure switch 0.3 bar (4 psi) 4 - Sending unit for w/shield washer 5 - Sending unit for brake fluid level 6 - Sending unit for coolant temperature and coolant level 7 - Contact 15, voltage supply 8 - not connected 9 - not connected 10 - not connected 11 - Display unit 6 point connection, terminal 5 and control lamp for w/shield washer warning light 12 - Display unit 8 point connection, terminal 2 and control lamp for oil pressure warning light 13 - Display unit 6 point connection, terminal 3 and control lamp for brake light 14 - Display unit 6 point connection, terminal 4 and control lamp for fuel warning light 15 - Display unit 6 point connection, terminal 1 and control lamp for brake fluid warning light 16 - Display unit 8 point connection, terminal 5 and control lamp for triangle warning light (positive) 17 - Display unit 8 point connection, terminal 7 and control lamp for "OK" emblem 18 - Display unit 8 point connection, terminal 4 and voltage supply 19 - Fuse/relay panel, connector F, terminal T and sending unit for fuel gauge 20 - 6 point wire connector to 4 point wire connector underneath dashboard on left side to alternator D+ (charge indicator lamp, contact 61) 21 - 3 point wire connector underneath dashboard on left side to front brake wear indicator 22 - 3 point wire connector underneath dashboard on left side to rear bulb control unit, terminal KS taillight 23 - 3 point wire connector underneath dashboard on left side to rear bulb control unit, terminal KB brake light 24 - Push button for auto-check-system 25 - not connected 26 - not connected 27 - ground terminal 28 - Display unit 6 point connection, terminal 2 and control lamp for low beam 29 - Display unit 8 point connection, terminal 1 and control lamp for battery 30 - Display unit 6 point connection, terminal 6 and control lamp for coolant temperature warning light 31 - not connected 32 - Display unit 8 point connection, terminal 3 and control lamp for brakepad warning light 33 - 6 point wire connector underneath dashboard on right side and fuse/relay panel, connector K and terminal 1 of ignition coil, on Diesel engine terminal W on alternator
34 - Display unit 8 point connection, terminal 6 and control lamp for red triangle (negative) 35 - Fuse/relay panel, connector G, terminal 86 N
FIG. 21:
Rear bulb control unit, terminals
KB to 35 point connector of main control unit terminal 23 KS to 35 point connector of main control unit terminal 22 and 3 point connector in engine compartment, left side 15 to 3 point connector for instrument cluster over relay for seat belt (relay 6) to 35 point connector of main control unit, terminal 7 31 to ground 54 to 6 point connector for instrument cluster and brake switch 58R to Fuse/relay panel connector H, terminal 58R 58L to Fuse/relay panel connector H, terminal 58L
FIG. 22:
Rear bulb control unit, terminals
54R to brake light, right side 54L to brake light, left side 58R 1 to taillight, right side 58L1 to taillight, left side
FIG. 23:
Front bulb control unit, terminals
K to 3 point connector for instrument cluster
56bR to Fuse/relay panel connector D, terminal 56bR 56bL to Fuse/relay panel connector D, terminal 56bL 56bR1 to head lamp/low beam and parking light, right 56bL1 to head lamp/low beam and parking light, left
FIG. 24:
Brake fluid level sending unit, checking
- remove sending unit
- measure resistance with Ohmmeter spec's, float up = infinity Ohm float down = 0 Ohm if not, replace sending unit
FIG. 25:
Coolant level sending unit, checking
- remove sending unit
- measure resistance with Ohmmeter spec's float up = infinity Ohm float down = 0 Ohm if not, replace sending unit
FIG. 26:
Hydraulic fluid level sending unit, checking
- remove sending unit
- measure resistance with Ohmmeter spec's, float up = infinity Ohm float down = O Ohm
FIG. 27:
Coolant temperature switch, checking
- measure resistance with Ohmmeter spec's, up to 120~C (248~F) = infinity Ohm above 120~C (248~F) = 0 Ohm
FIG. 28:
Sending unit, windshield/washer level, checking
- remove washer tank
- measure resistance on sending unit with Ohmmeter spec's: tank filled = infinity Ohm tank empty = 0 Ohm if not, replace washer tank
FIG. 29:
Hydraulic pressure warning switch, checking
- disconnect wire on warning switch
- press brake pedal about 20 times, engine not running
- measure resistance with Ohmmeter spec's = 0 Ohm
- start engine, let idle for about 1 minute
- measure resistance with Ohmmeter spec's = infinity Ohm