300SEL (126.025) L6-3.0L (103.981) (1988)
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Switch ignition (1) off.
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Disconnect and cover battery negative terminal.
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Remove foot mat in passenger's footwell.
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Unscrew plastic nut on foot rest (2), wrench size 8.
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Disconnect red 10-pin plug connection airbag (X29/9).
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Remove ash tray.
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Unscrew 2 phillips screws (4) on ash tray housing.
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Remove ashtray housing and storage tray (6).
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Remove radio (5).
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Pull off plug connection on control unit.
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Unscrew 2 screws (7) on control unit.
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Remove control unit.
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Install in reverse order noting the following.
Installation Note: Arrow on control unit must point in driving direction. Install in reverse sequence.
Testing After Renewing the Control Unit: