DTC P0850:29 [Advanced Keyless Entry And Push Button Start System]

DESCRIPTION	Erratic signal of TR switch
DETECTION CONDITION	CAN and TR switch signals do not correspond. Keyless control module detects that the TR switch stuck off for 5 s while the ignition is ON. Starter monitor input voltage is above the specification when the CAN signal is P or N range. Keyless control module detects that the TR switch stuck ON for 5 s while the ignition is ON. Starter monitor input voltage is less than the specification when the CAN signal is R or D range.
POSSIBLE CAUSE	Starter relay malfunction TR switch connector or terminals malfunction TR switch malfunction Keyless control module connector or terminals malfunction Short to ground in wiring harness between the following terminals: Starter relay terminal A-Keyless control module terminal 2F Starter relay terminal A-TR switch terminal F TR switch terminal A-Keyless control module terminal 3T Short to power supply in wiring harness between the following terminals: Starter relay terminal A-Keyless control module terminal 2F Starter relay terminal A-TR switch terminal F TR switch terminal A-Keyless control module terminal 3T Open circuit in wiring harness between the following terminals: Starter relay terminal A-Keyless control module terminal 2F Starter relay terminal A-TR switch terminal F TR switch terminal A-Keyless control module terminal 3T Keyless control module malfunction

DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	INSPECT STARTER RELAY Switch the ignition to off. Disconnect the negative battery cable. Remove the starter relay. Inspect the starter relay. (See RELAY INSPECTION ). Is there any malfunction?	Yes	Replace the relay, then go to Step 8.
1		No	Install the relay, then go to the next step.
2	INSPECT TR SWITCH CONNECTOR AND TERMINALS Disconnect the TR switch connector. Inspect the connector and terminals (corrosion, damage, pin disconnection). Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 8.
2		No	Go to the next step.
3	INSPECT TR SWITCH Reconnect the TR switch connector. Reconnect the negative battery cable. Inspect the TR switch. (See TRANSAXLE RANGE (TR) SWITCH INSPECTION [FS5A-EL] ). Is there any malfunction?	Yes	Replace the TR switch, then go to Step 8. (See TRANSAXLE RANGE (TR) SWITCH REMOVAL/INSTALLATION [FS5A-EL] ).
3		No	Go to the next step.
4	INSPECT KEYLESS CONTROL MODULE CONNECTOR AND TERMINALS Disconnect the negative battery cable. Disconnect the keyless control module connector. Inspect the connector and terminals (corrosion, damage, pin disconnection). Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 8.
4		No	Go to the next step.
5	INSPECT TR SWITCH CIRCUIT FOR SHORT TO GROUND Keyless control module connector is disconnected. Remove the starter relay. Disconnect the TR switch connector. Inspect for continuity between the following terminals (wiring harness-side) and body ground: Starter relay terminal A TR switch terminal A Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to ground, then go to Step 8.
5		No	Go to the next step.
6	INSPECT TR SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY Starter relay is removed. Keyless control module connector is disconnected. Reconnect the negative battery cable. Switch the ignition to ON. Measure the voltage at the following terminals (wiring harness-side): Starter relay terminal A TR switch terminal A Is there any voltage?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 8.
6		No	Go to the next step.
7	INSPECT TR SWITCH CIRCUIT FOR OPEN CIRCUIT Starter relay is removed, and TR switch and keyless control module connectors are disconnected. Switch the ignition to off. Disconnect the negative battery cable. Inspect for continuity between the following terminals (wiring harness-side): Starter relay terminal A-Keyless control module terminal 2F Starter relay terminal A-TR switch terminal F TR switch terminal A-Keyless control module terminal 3T Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
8	VERIFY TROUBLESHOOTING COMPLETED Make sure to reconnect the disconnected connectors. Reconnect the negative battery cable. Operate the advanced key to activate the keyless control module. Clear the DTC from the keyless control module using the M-MDS. (See CLEARING DTC [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] ). Switch the ignition to ON using the advanced key. Perform the advanced keyless entry and push button start system DTC inspection using the M-MDS. (See DTC INSPECTION [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] ). Is the same DTC present?	Yes	Replace the keyless control module, then go to the next step. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION ).
8		No	Go to the next step.
9	VERIFY THAT NO OTHER DTCs ARE PRESENT Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] ).
9		No	DTC troubleshooting completed.