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  • P1596 Speed Control Switch Always High

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    DTC P1596: SPEED CONTROL SWITCH ALWAYS HIGH

    1. Start engine and allow engine to idle. Using scan tool in INPUTS/OUTPUTS mode, read speed control inputs. Monitor display on scan tool while turning speed control on/off switch on the steering wheel to ON and OFF positions several times with the switch returned to the ON position. If scan tool displays speed control on/off switch turns OFF and ON, go to next step. If scan tool does not display speed control on/off switch turns OFF and ON, go to step 3 .

    2. At this time, conditions required for DTC to be stored are not present. Ensure engine is idling. Using scan tool, monitor speed control on/off switch voltage while wiggling wiring harness and connectors between speed control on/off switch and PCM. PCM is located at passenger's side rear corner of engine compartment. If voltage is not more than 4.9 volts at any time while wiggling wiring harness and connectors, test is complete. If voltage is more than 4.9 volts at any time while wiggling wiring harness and connectors, repair wiring or connector as necessary that caused the voltage to fluctuate. Perform TEST VER-4A .

    3. Shut engine off. Ensure ignition is off. Disconnect speed control on/off switch 2-pin connector at rear of speed control on/off switch assembly. DO NOT disconnect any other connectors except the 2-pin connector. Using ohmmeter, check resistance between ground and terminal No. 1 (White wire) on speed control on/off switch 2-pin connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open ground circuit on White wire. The White wire goes from speed control on/off switch, through clockspring and then changes to Black/Light Blue wire at clockspring and goes to terminal No. 4 on PCM connector C1. Clockspring is located on steering column, just below steering wheel. See Fig. 60 . PCM is located at passenger's side rear corner of engine compartment. Perform TEST VER-4A .

    4. Ensure speed control on/off switch 2-pin connector at rear of speed control on/off switch assembly is still disconnected. Start engine and allow engine to idle. Using voltmeter, check voltage at terminal No. 2 (Dark Green/Red wire) on speed control on/off switch 2-pin connector. If voltage is less than 6 volts, go to next step. If voltage is more than 6 volts, repair short to voltage on Dark Green/Red wire. The Dark Green/Red wire goes from speed control on/off switch, through clockspring and then changes to Red/Light Green wire at clockspring and goes to terminal No. 32 on PCM connector C3. Clockspring is located on steering column, just below steering wheel. See Fig. 60 . PCM is located at passenger's side rear corner of engine compartment. Perform TEST VER-4A .

    5. Shut engine off. Ensure ignition is off and speed control on/off switch 2-pin connector at rear of speed control on/off switch assembly is still disconnected. Disconnect PCM connectors. PCM is located at passenger's side rear corner of engine compartment. Using ohmmeter, check resistance between terminal No. 32 (Red/Light Green wire) on PCM connector C3 and terminal No. 2 (Dark Green/Red wire) on speed control on/off switch 2-pin connector. The Dark Green/Red wire goes from speed control on/off switch, through clockspring and then changes to Red/Light Green wire at clockspring and goes to terminal No. 32 on PCM connector C3. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, go to step 7 .

    6. Using ohmmeter, check resistance between electrical terminals on speed control on/off switch. If resistance is 20,300-20,700 ohms, replace PCM. Perform TEST VER-4A . If resistance is not 20,300-20,700 ohms, replace speed control on/off switch. Perform TEST VER-4A .

    7. Ensure ignition off and PCM connectors are still disconnected. Disconnect clockspring connector C1. See Fig. 60 . Using ohmmeter, check resistance between terminal No. 1 (Red/Light Green wire) on clockspring connector C1 and terminal No. 32 (Red/Light Green wire) on PCM connector C3. If resistance is less than 5 ohms, replace clockspring. Perform TEST VER-4A . If resistance is 5 ohms or more, repair open on Red/Light Green wire between clockspring and PCM. Perform TEST VER-4A .


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