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Test No. 3, Control Switch Circuit

  1. Disconnect junction connector. Junction connector is a 20-pin Black connector located behind left side of instrument panel, near steering column. Check for continuity between ground and cruise control switch ground terminal at junction connector. See IDENTIFYING CRUISE CONTROL SWITCH GROUND  table. If continuity exists, go to next step. If continuity does not exist, repair faulty ground, or locate and repair open in wiring harness between ground and junction connector.
    IDENTIFYING CRUISE CONTROL SWITCH GROUND

    Application Terminal No. (1) Wire Color
    Land Cruiser 20 BRN
    (1) Check at junction connector.
  2. Check cruise control switch. See CRUISE CONTROL SWITCH  under COMPONENT TESTING. Replace switch as necessary and recheck system operation. If switch is okay, reconnect junction connector and go to next step.
  3. Disconnect CC ECU connector. See Figure. With cruise control switch off, check for continuity between ground and cruise control main switch circuit terminal at CC ECU connector. See IDENTIFYING CRUISE CONTROL MAIN SWITCH CIRCUIT  table. If continuity exists, go to next step. If continuity does not exist, locate and repair short in wiring harness between CC ECU connector and cruise control switch.
    IDENTIFYING CRUISE CONTROL MAIN SWITCH CIRCUIT

    Application CC ECU Terminal No. Wire Color
    Land Cruiser 4 YEL/RED
  4. With cruise control switch on, check for continuity between ground and cruise control main switch circuit terminal at CC ECU connector. See IDENTIFYING CRUISE CONTROL MAIN SWITCH CIRCUIT  table. If continuity exists, go to next step. If continuity does not exist, locate and repair open in wiring harness between CC ECU connector and cruise control switch.
  5. With cruise control switch off, check for continuity between ground and terminal CC ECU connector terminal No. 18 (Black/Green wire). If continuity does not exist, go to next step. If continuity exists, locate and repair short in wiring harness between CC ECU connector and cruise control switch.
  6. With cruise control switch in specified position, measure resistance between ground and CC ECU connector terminal No. 18 (Black/Green wire). See CRUISE CONTROL SWITCH RESISTANCE  table. If resistance is as specified, replace CC ECU and recheck system operation. If resistance is not as specified, locate and repair open in wiring harness between CC ECU connector and cruise control switch.
CRUISE CONTROL SWITCH RESISTANCE

Switch Position (1) Ohms
RES/ACC 68
SET/COAST 198
CANCEL 418
(1) Specification is approximate.
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