Seats - Front Power Seat Switch Replacement
85mercedes01TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS
DATE: January, 1985 (supersedes 82/30 March 1983) REF. NO. 82/36
SUBJECT: REPLACEMENT OF SWITCH FOR FRONT POWER SEATS (SOLDERED TYPE) MODEL 126
If a power seat switch, soldered to the wiring harness (Figure 1) is defective, it can now be replaced with a switch and plug assembly.
Procedure
1. Disconnect negative (-) battery terminal.
2.. Remove door panel and peel back the plastic sheet in the area of the power seat switch.
Figure 1 - Switch Cover Removed:
3. Unscrew switch, remove rear cover of switch (Figure 1) and unsolder the electrical wires.
Figure 2 - Power Seat Switch, Left:
Figure 3 - Power Seat Switch, Right:
4. Use the pin socket layout and wire color diagrams (Figures 2 and 3) to solder the appropriate size pin socket (2.5 or 4.0 mm) to the proper wire and insert each into the plug as shown.
Figure 2 - Power Seat Switch, Left:
Plug connector A
1 blue 2 violet 3 brown 4 red 5 white 6 black
Plug connector B
1 grey 2 orange 3 red/white* 5 yellow 6 green
Figure 3 - Power Seat Switch, Right:
Plug connector A
1 violet 2 blue 3 red 4 brown 5 white 6 black
Plug connector B
1 grey 2 orange 4 red/white* 5 green 6 yellow
*If the wiring harness does not have the red/white wire (1st version), a jumper wire has to be connected between plug connection A and B: At the left switch, from plug A (No. 4) to plug B (No. 3); at the right switch, from plug A (No. 3) to plug B (No. 4).
Figure 4:
5. Insert plug connectors on switch (Figure 4), connect battery and check for the proper functions of power seat.
6. Install switch and plastic sheet to door and re-install door panel.
Parts Information
Qty. Part Name Part Number
1 Switch, left 003 820 14 10
1 Switch, right 003 820 13 10
1 Trim plate, left 126 766 41 91
1 Trim plate, right 126 766 30 91
1 Backrest adjuster, left 000 821 07 58
1 Backrest adjuster, right 000 821 08 58
1 Plug connector 126 545 38 28 }
1 Plug connector 126 545 40 28 }
8 Pin socket 2.5 mm dia.
001 545 28 26 }
3 Pin socket 4.0 mm dia.
001 545 35 26 } per switch
1 Snap ring
000 821 04 34 }
2 Screw 914127 004218 }
Time Allowance
02-8217 51, 52, 54, 56 Power Seat Switch, Front, Replace 1.7 hour
02-8217 53, 55 Power Seat Switch, Front, Replace 1.9 hour
02-8218 51, 52, 54, 56
Power Seat Switch, Front, Replace 1.4 hour
(with maintenance or repair work)
02-8218 53, 55 Power Seat Switch, Front, Replace 1.7 hour
(with maintenance or repair work)