Normal Operation

The steering column control switch is connected to the Driver Seat Module (DSM) along 3 circuits that are part of 2 wire harnesses:

• 14D231 (DSM)
• 14A005 (steering column switch)

The 2 wire harnesses are connected at C339. The wire color and circuit number of some of the steering column control switch circuits will change when passing through C339. The following chart indicates the circuit number and wire color change with respect to the harness in which they are located.

The steering column control switch is connected to the DSM along circuits CPP12 (BN/GN), CPP13 (GY/OG) and RPP20 (GN/OG)/CPP14 (BN/WH). Battery voltage is provided to the switch from Smart Junction Box (SJB) fuse 13 (5A) along circuit SBP13 (GY/RD). The switch is connected to ground along circuit GD116 (BK/VT). Moving the steering column control switch applies a combination of power and ground to the 3 circuits to signal the DSM to move the adjustable steering column in the desired direction. Moving the switch forward or rearward will apply ground or power to circuit CPP13 (GY/OG). Moving the switch up or down will apply ground or power to circuit CPP12 (BN/GN). CPP14 (BN/WH) is used in all switch positions as a redundant input to ensure the steering column switch signal is valid. For example, if the steering column control switch is moved to the tilt down position, the switch will apply power on CPP12 (BN/GN) and ground on RPP20 (GN/OG)/CPP14 (BN/WH). If the switch is moved in the tilt up position, ground will be applied to circuit CPP12 (BN/GN) and power to RPP20 (GN/OG)/CPP14 (BN/WH).

If the DSM detects an invalid combination of power/ground signals on the steering column control switch circuits, a DTC will set. If the steering column control switch is stuck or if it is held in a single position for longer than 2 minutes, or if the steering column control switch is operated during an on-demand self test, a DTC will be set. Because the steering column control switch can apply both power and ground to the switch circuits, a DTC indicating the steering column control switch circuits are shorted to battery could be caused by a short to ground or an open on any of the switch circuits. If a steering column control switch circuit DTC is retrieved from an on-demand self test, all 5 switch circuits should be checked.

• DTC B2A41 (Steering Column Telescopic Rear Switch Short to Battery) - If circuit CPP12 (BN/GN), CPP13 (GY/OG) or RPP20 (GN/OG)/CPP14 (BN/WH) is shorted to power or ground or if either circuit is open, this DTC will set. If the steering column control switch is held or stuck in 1 position for more than 2 minutes, or if the switch is operated during an on-demand self test, this DTC will set.
• DTC B2A42 (Steering Column Tilt Up Switch Short to Battery) - If circuit CPP12 (BN/GN), CPP13 (GY/OG) or RPP20 (GN/OG)/CPP14 (BN/WH) is shorted to power or ground, this DTC will set. If the steering column control switch is held or stuck in 1 position for more than 2 minutes, or if the switch is operated during an on-demand self test, this DTC will set.
• DTC B2A44 (Steering Column Telescopic Forward Switch Short to Battery) - If circuit CPP12 (BN/GN), CPP13 (GY/OG) or RPP20 (GN/OG)/CPP14 (BN/WH) is shorted to power or ground, this DTC will set. If the steering column control switch is held or stuck in 1 position for more than 2 minutes, or if the switch is operated during an on-demand self test, this DTC will set.

This pinpoint test is intended to diagnose the following: 

• Fuses
• Wiring, terminals or connectors
• Steering column control switch
• DSM