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Steering Column Switches: Overview Mercury Mariner II

Ignition Switch/steering Lock 2 illustrations ~1274 words

The steering column switches consist of the following

  1. Ignition switch
  2. Multi-function switch

The ignition switch is mounted to the LH side of the steering column and is used in conjunction with the ignition lock cylinder key and steering column lock module to start the vehicle. When the lock cylinder key is switched to different positions, it moves a mechanical link in the steering column lock module, which enables the ignition switch to send battery voltage to various components.

The integrated multi-function switch is also mounted to the LH side of the steering column and controls the high beam/low beam, flash-to-pass, turn signals, hazard flashers and windshield wiper switches.

Special Tools Illustration Tool Name Tool Number 73III Automotive Meter 105-R0057 or equivalent Flex Probe Kit 105-R025B or equivalent Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool

Scheme 1

Scheme 1: Steering Column Switches
Scheme 1: Steering Column Switches

Scheme 2

Scheme 2
Scheme 2

Principles of Operation

Note. The smart junction box (SJB) is also identified as the generic electronic module (GEM).

The steering column switches include the ignition switch, the multi-function switch (high beam/low beam, flash-to-pass, turn signal and windshield wiper) and the key release interlock actuator.

Normal Operation

The ignition switch receives fused battery voltage along circuit SBP27 (BU/RD) from smart junction box (SJB) fuse 27 (20A). The ignition switch then sends that voltage out to various systems depending on ignition switch position. The ignition switch has 4 possible states

  1. OFF - No power on any circuits
  2. ACC - Power on circuit CDC33 (VT/GN)
  3. RUN - Power on circuits CDC33 (VT/GN) and CDC34 (WH/OG)
  4. START - Power on circuit CDC34 (WH/OG), CDC35 (BU/WH) and CE619 (BU/BN) (non-hybrid vehicles)

This pinpoint test is intended to diagnose the following

  1. Fuse
  2. Wiring, terminals or connectors
  3. Ignition switch
  4. SJB

When the ignition switch is placed in ACC, fused ignition voltage is sent to smart junction box (SJB) C2280a-3 along circuit CDC33 (VT/GN).

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Ignition switch
  3. SJB

When the ignition switch is placed in RUN, fused ignition voltage is sent to

  1. smart junction box (SJB) C2280a-3 along circuit CDC33 (VT/GN).
  2. SJB C2280e-1 along circuit CDC34 (WH/OG).
  3. SJB C2208b-45 along circuit CDC34 (WH/OG).
  4. fuse 35 (10A) in the battery junction box (BJB) along circuit CDC34 (WH/OG).

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Ignition switch
  3. SJB

When the ignition switch is placed in START, fused ignition voltage is sent to

Hybrid Vehicles

  1. fuse 35 (10A) in the battery junction box (BJB) along circuit CDC34 (WH/OG).
  2. smart junction box (SJB) connector C2280e-1 along circuit CDC34 (WH/OG).
  3. SJB connector C2280b-45 along circuit CDC34 (WH/OG).
  4. PCM connector C175b-21 along circuit CDC35 (BU/WH).
  5. SJB C2280b-32 along circuit CDC35 (BU/WH).

Non-Hybrid Vehicles

  1. fuse 35 (10A) in the BJB along circuit CDC34 (WH/OG).
  2. SJB connector C2280e-1 along circuit CDC34 (WH/OG).
  3. SJB connector C2280b-45 along circuit CDC34 (WH/OG).
  4. PCM connector C175b-7 along circuit CDC35 (BU/WH).
  5. BJB starter diode along circuit CDC35 (BU/WH), then through the diode to: SJB C2280b-32 along circuit CE619 (BU/BN). PCM C175b-4 along circuit CE619 (BU/BN). transmission range (TR) sensor C167-4 along circuit CE619 (BU/BN).

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Ignition switch
  3. SJB

The ignition switch is spring loaded to automatically return to the RUN position after being placed in the START position. When the ignition switch is placed in START, fused ignition voltage is sent to

Hybrid Vehicles

  1. fuse 35 (10A) in the battery junction box (BJB) along circuit CDC34 (WH/OG).
  2. smart junction box (SJB) connector C2280e-1 along circuit CDC34 (WH/OG).
  3. SJB connector C2280b-45 along circuit CDC34 (WH/OG).
  4. PCM connector C175b-21 along circuit CDC35 (BU/WH).
  5. SJB C2280b-32 along circuit CDC35 (BU/WH).

Non-Hybrid Vehicles

  1. fuse 35 (10A) in the BJB along circuit CDC34 (WH/OG).
  2. SJB connector C2280e-1 along circuit CDC34 (WH/OG).
  3. SJB connector C2280b-45 along circuit CDC34 (WH/OG).
  4. PCM connector C175b-7 along circuit CDC35 (BU/WH).
  5. BJB starter diode along circuit CDC35 (BU/WH), then through the diode to: SJB C2280b-32 along circuit CE619 (BU/BN). PCM C175b-4 along circuit CE619 (BU/BN). transmission range (TR) sensor C167-4 along circuit CE619 (BU/BN).
  1. B2A20 Ignition Stuck in START - The SJB continuously monitors the ignition switch state, if the SJB detects voltage on circuit CDC35 (BU/WH) or CE619 (BU/BN) for more than 30 seconds, DTC B2A20 will be set.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Ignition switch
  3. SJB

When placed in ACC, RUN or START, the ignition switch sends voltage out to the smart junction box (SJB). Micro-processors in the SJB continuously monitor the ignition switch state. The ignition switch has 4 possible states

  1. OFF
  2. ACC
  3. RUN
  4. START

When the ignition switch is placed in ACC, fused ignition voltage is sent to SJB C2280a-3 along circuit CDC33 (VT/GN).

When the ignition switch is placed in RUN, fused ignition voltage is sent to

  1. SJB C2280a-3 along circuit CDC33 (VT/GN).
  2. SJB C2280e-1 along circuit CDC34 (WH/OG).
  3. SJB C2208b-45 along circuit CDC34 (WH/OG).
  4. fuse 35 (10A) in the battery junction box (BJB) along circuit CDC34 (WH/OG).

When the ignition switch is placed in START, fused ignition voltage is sent to

Hybrid Vehicles

  1. fuse 35 (10A) in the BJB along circuit CDC34 (WH/OG).
  2. SJB connector C2280e-1 along circuit CDC34 (WH/OG).
  3. SJB connector C2280b-45 along circuit CDC34 (WH/OG).
  4. PCM connector C175b-21 along circuit CDC35 (BU/WH).
  5. SJB C2280b-32 along circuit CDC35 (BU/WH).

Non-Hybrid Vehicles

  1. fuse 35 (10A) in the BJB along circuit CDC34 (WH/OG).
  2. SJB connector C2280e-1 along circuit CDC34 (WH/OG).
  3. SJB connector C2280b-45 along circuit CDC34 (WH/OG).
  4. PCM connector C175b-7 along circuit CDC35 (BU/WH).
  5. BJB starter diode along circuit CDC35 (BU/WH), then through the diode to: SJB C2280b-32 along circuit CE619 (BU/BN). PCM C175b-4 along circuit CE619 (BU/BN). transmission range (TR) sensor C167-4 along circuit CE619 (BU/BN).
  1. B2844 Ignition Fault - If the SJB receives an invalid ignition switch state or cannot detect the ignition switch state during normal operation, DTC B2844 is set.
  2. U2472 Unexpected Ignition State - If the SJB does not receive the ignition RUN signal, or any ignition switch signal, while carrying out an SJB self test, DTC U2472 is set.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Ignition switch
  3. SJB

When the ignition key is inserted into the ignition lock cylinder, an internal switch in the ignition switch assembly closes and battery voltage is sent to the smart junction box (SJB) along circuit CDC30 (BU/GY).

When the gear selector is placed in a position other than PARK, the key release interlock actuator (part of the ignition switch assembly) prevents the key from being removed from the ignition switch. The key release interlock actuator receives fused battery voltage from SJB fuse 27 (20A) along circuit SBP27 (BU/RD). Ground for the actuator is provided along circuit CDC41 (WH/BN), through the park detection switch (part of the gear selector assembly) and then along circuit GD112 (BK/GN). When the gear selector lever is placed in a position other than PARK, the park detection switch closes and connects circuit CDC41 (WH/BN) to circuit GD112 (BK/GN), this grounds the key release actuator and prevents the key from being removed from the ignition switch.

  1. B1352 Ignition Key-In Circuit Failure - When the battery voltage is between 10 volts and 15.5 volts and the ignition switch is in the RUN position, if the ignition key is removed from the ignition switch or if there is an open in circuit CDC30 (BU/GY), DTC B1352 will be set.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Ignition switch
  3. Park detection switch (part of the gear selector lever)
  4. SJB

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