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Circuit/System Testing

NOTE:

Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

Set, Up and Down Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S78 Turn Signal/ Multifunction Switch, ignition ON.
  2. Test for less than 1 V between the low reference circuit terminal 6 and ground.
    • If 1 V or greater, repair the short to voltage on the circuit.
    • If less than 1 V
  3. Test for less than 10 Ω between the low reference circuit terminal 6 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the P16 instrument cluster.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the P16 instrument cluster.
    • If less than 10 Ω 
  4. Test for 11.8-12.2 V between the signal circuit terminal 12 and ground.
    • If less than 11.8 V 
    1. Ignition OFF, disconnect the harness connector at the P16 instrument cluster.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the P16 instrument cluster.
    • If greater than 12.2 V 
    1. Ignition OFF, disconnect the harness connector at the P16 instrument cluster, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the P16 instrument cluster.
    • If between 11.8-12.2 V 
  5. Test or replace the S48A multifunction switch.

Menu Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S78 Turn Signal/ Multifunction Switch, ignition ON.
  2. Test for 4.8-5.2 V between the signal circuit terminal 5 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector at the P16 instrument cluster.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the P16 instrument cluster.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the harness connector at the P16 instrument cluster, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the P16 instrument cluster.
    • If between 4.8-5.2 V 
  3. Test for less than 10 Ω between ground circuit terminal 3 and ground.
    • If 10 Ω or greater, repair the open/high resistance in the circuit.
    • If less than 10 Ω
  4. Test or replace the S78 Turn Signal/Multifunction Switch.
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