Snow Mode Switch

SNOW MODE SWITCH


Description

The snow mode switch signal is sent to the "unified meter and A/C amp." from the snow mode switch. The "unified meter and A/C amp." then sends the signal to the ECM by CAN communication line.
The snow mode is used for driving or starting the vehicle on snowy roads or slippery areas. If the snow mode is activated, the vehicle speed will not be accelerated immediately than the original pedal in due to avoid the vehicle slip. In other words, ECM controls the rapid engine torque change by controlling the electric throttle control actuator operating speed.




SNOW MODE SWITCH


Diagnosis Procedure

1.CHECK SNOW MODE SWITCH OVERALL FUNCTION-I
Confirm the malfunctioning circuit (snow mode switch or snow mode indicator). Refer to Component Function Check.
Which circuit is related to the incident?
Snow mode switch-GO TO 2.
Snow mode indicator-GO TO 7.
2.CHECK DTC WITH "UNIFIED METER AND A/C AMP."
Refer to Diagnosis System (Unified Meter and A/C AMP.).
Is the inspection result normal?
YES - GO TO 3.
NO - Go to Work Flow.
3.CHECK SNOW MODE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect snow mode switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between snow mode switch harness connector and ground.





Is the inspection result normal?
YES - GO TO 5.
NO - GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E106, M6
- Harness connectors M134, M170
- IPDM E/R harness connector E7
- 10 A fuse (No. 43)
- Harness for open or short between snow mode switch and fuse
- Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK SNOW MODE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect "unified meter and A/C amp." harness connector.
3. Check the continuity between snow mode switch harness connector and "unified meter and A/C amp." harness connector.





4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - GO TO 7.
NO - GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M134, M170
- Harness for open or short between snow mode switch and "unified meter and A/C amp."
- Repair open circuit or short to ground or short to power.
7.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection M95. Refer to Ground Inspection in Circuit Inspection.
Is the inspection result normal?
YES - GO TO 8.
NO - Repair or replace ground connection.
8.CHECK SNOW MODE INDICATOR LAMP GROUND CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between snow mode switch harness connector and ground.





2. Also check harness for short to power.
Is the inspection result normal?
YES - GO TO 10.
NO - GO TO 9.
9.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M134, M170
- Harness for open or short between snow mode switch and ground
- Repair open circuit or short to power in harness or connectors.
10.CHECK SNOW MODE SWITCH
Refer to Component Inspection.
Is the inspection result normal?
YES - GO TO 11.
NO - Replace snow mode switch.
11.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
- INSPECTION END