Part 2 of 3
DOOR CYLINDER LOCK SWITCHA door cylinder lock switch is snapped onto the back of the key lock cylinder inside each front door. The door cylinder lock switch is a resistor multiplexed momentary switch that is hard wired in series between a body ground and the Central Timer Module (CTM) through the front door wire harness. The door cylinder lock switches are driven by the key lock cylinders and contain three internal resistors. One resistor is used for the neutral switch position, one for the Lock position, and one for the Unlock position.
The door cylinder lock switches cannot be adjusted or repaired and, if faulty or damaged, they must be replaced.
The door cylinder lock switches are actuated by the key lock cylinder when the key is inserted in the lock cylinder and turned to the lock or unlock positions. The door cylinder lock switch closes a path to ground through one of three internal resistors for the Central Timer Module (CTM) when the front door key lock cylinder is in the Lock, Unlock, or Neutral positions. The CTM reads the switch status through an internal pull-up, then uses this information as an input for both power lock system and Vehicle Theft Security System (VTSS) operation.
The door cylinder lock switches and circuits can be diagnosed using conventional diagnostic tools and methods.
DRIVER DOOR MODULE
A Driver Door Module (DDM) is used on all models equipped with power locks, power windows, and power mirrors. The driver door module consists of a molded plastic housing that is secured with three screws to a molded plastic switch bezel. The switch bezel is secured by metal snap clips within an opening near the forward end of the arm rest in the driver side front door trim panel so that the DDM can be serviced without removing the front door trim panel. Two integral connector receptacles on the back of the DDM connect it to the vehicle electrical system through two take outs and connectors of the left front door wire harness. The DDM houses the following switches:
- Power Lock Switch - The DDM includes a two-way, momentary, resistor multiplexed switch to control the power lock system.
- Power Mirror Selector Switch - A three-position rocker switch in the DDM selects the right or left power mirror for adjustment, or turns the power mirror system OFF.
- Power Mirror Adjustment Switches - Four momentary) arrowhead shaped, directional switches allow the driver to adjust the selected power mirror in the Up, Down, Right, or Left directions.
- Power Window Lockout Switch - A two-way, latching, push-button switch in the DDM allows the vehicle operator to lock out the power window switches on each passenger door so that the passenger door power windows may be operated only from the master switches in the DDM.
- Power Window Switches - The DDM houses a two-way, momentary power window switch for the driver side front door. This switch also has a second detent in the Down direction and internal circuitry to provide an Auto-Down feature for the driver side front door power window. In addition to the power window switch for its own door, the DDM houses individual master switches for each passenger door power window.
The DDM also incorporates several green Light Emitting Diodes (LED's) that illuminate the power lock and power window switch paddles, and the power mirror switch directional buttons to improve switch visibility in dark ambient lighting conditions. The DDM cannot be adjusted or repaired and, if faulty or damaged, the entire DDM unit must be replaced.
The Driver Door Module (DDM) combines a power lock switch, a driver power window switch with an Auto-down feature, master switches for each passenger door power window, a power window lockout switch, a power mirror selector switch, and four power mirror adjustment switches in a single unit. The switches in the DDM can be diagnosed using conventional diagnostic tools and methods.
Power Lock Switch
The DDM power lock switch circuitry is connected in series between ground and the driver door switch mux input of the Central Timer Module (CTM). Each power lock switch position (Lock, Unlock, and Neutral) provides a different resistance value to the CTM input, which allows the CTM to sense the switch position. Based upon the power lock switch input, the CTM controls the battery and ground feed outputs to the individual power lock motors to lock or unlock the door and liftgate latches. The Light-Emitting Diode (LED) in the DDM power lock switch is connected to battery current through the power window circuit breaker in the Junction Block (JB) on a fused ignition switch output (run-acc) circuit so that the switch will be illuminated whenever the ignition switch is in the ON or Accessory positions.
Power Window Switches
The DDM power window switch circuitry is connected to battery current through a circuit breaker in the Junction Block (JB) on a fused ignition switch output (run-acc) circuit so that the power windows will operate whenever the ignition switch is in the ON or Accessory positions. Each two-way, momentary master passenger power window switch in the DDM provides battery current and ground to the individual power window switches on each passenger door so that the power window switch controls the battery current and ground feeds to its respective power window motor. The DDM switch for the driver side front door power window is labeled with the text "Auto" and includes an auto-down feature. When this switch is depressed to a second momentary detent position and released, the driver door power window is automatically operated through an internal circuit and relay to its fully lowered position. The Auto-down event is cancelled if the switch paddle is depressed a second time in either the Up or Down direction. When the two position window lockout switch in the DDM is depressed and latched in the lockout position, the battery current feed to each of the individual passenger power window switches is interrupted so that the passenger door power windows can only be operated from the master switches in the DDM. The window lockout switch also controls the battery current feed for the LED in each passenger power window switch so that the switch will not be illuminated when it is locked out.
Power Mirror Switches
The DDM power mirror switch circuitry is connected to battery current through a fuse in the JB on a fused B(+) circuit so that the power mirrors remain operational regardless of the ignition switch position. A rocker type selector switch has three positions, one to select the right mirror, One to select the left mirror, and a neutral OFF position. After the right or left mirror is selected, one of four directional buttons is depressed to move the selected mirror Up, Down, Right or Left. The DDM power mirror switch circuitry controls the battery current and ground feeds to each of the four (two in each mirror head) power mirror motors. The Light-Emitting Diode (LED) in the DDM power mirror switch is connected to battery current through the power window circuit breaker in the Junction Block (JB) on a fused ignition switch output (run-acc) circuit so that the switch directional buttons will be illuminated whenever the ignition switch is in the ON or Accessory positions.